English words: open beta to operant conditioning

300 English words, part 28 of 67 of the words starting with O, A to Z. 16 have a page of their own.

English words open beta to operant conditioning

open beta noun: Something that is in its beta stage, or being tested.
open bite noun: A configuration of a mouth wherein the front top teeth are separated vertically from the front bottom teeth even while the back top teeth are resting...
open boarding noun: A system of bus operation where passengers may enter through various doors along the vehicle's length without having to pass the driver to buy or show a ticket.
open book adjective, noun: Designating exams in which specified external resources, potentially including textbooks, glossaries, study notes, calculators, etc. may be used.
open-book contract noun: A contract in which the buyer and seller of work or services agree on (i) which costs are remunerable and (ii) the margin that the supplier can add to these...
open book decomposition noun: A decomposition of a 3-manifold into a link and a fibration over the circle by surfaces bounded by that link.
open bowling noun: Unsanctioned bowling; the sport of bowling played casually or unofficially.
open box adjective: Pertaining to a product sold by a merchant at a discount, because the item was returned but found not to be defective.
open-breasted adjective: Frank, unsecretive; not concealing one's feelings.
open call noun: An open and/or public audition, especially for actors and actresses.
open caption noun: Captions that are permanently embedded or burned in directly into a video image, rendering them always visible to a viewer without the option to turn them off.
open captioning noun: The process or technique of creating and embedding open captions directly into media during production.
open carry noun, verb: The practice of openly carrying a firearm in public.
open-cast adjective: Alternative form of opencast.
open-chain adjective: Having carbon atoms arranged in a linear rather than cyclical chain.
open circuit noun: An incomplete electrical circuit through which no current can flow.
open circuit voltage noun: The difference of electrical potential between two terminals of a device when disconnected from any circuit. The open-circuit voltage of a cell is its EMF...
open circulatory system noun: A system of circulation which is achieved primarily from the heart beating and muscle-induced locomotion of the organism, circulation without veins.
open city noun: A city which has announced (during wartime) that it has abandoned all defensive efforts, generally in the event of its imminent capture.
open class noun: A set of words in a given language that can readily gain new members.
open classroom noun: A single large room used for teaching a large group of pupils of varying ability, who are typically divided into smaller groups.
open cluster noun: a more or less irregular star cluster containing tens to thousands of stars
open-collar adjective: Of or pertaining to work that is performed from home, especially by means of the Internet.
open comedo noun: Synonym of blackhead (a type of skin blemish).
open comedone noun: Alternative form of open comedo.
open communion noun: Synonym of open table.
open compound noun: A compound word with spaces in it, for example, high school, school bus, or science fiction.
open-concept adjective: Where rooms share a large, connected space.
open content noun: Creative work that others can freely and legally copy or modify.
open convention noun: Synonym of brokered convention.
open core noun: A business model for software whereby the core is open-source and free, while closed-source add-ons are available for purchase.
open cover noun: A cover whose members are all open sets.
open curve noun: Any curve where its two endpoints do not touch.
open dating noun: The use of a date or code stamped on food packaging to help determine how long to display the product for sale.
open day noun: A casual event where an institution is open for visiting and inspection by anyone interested.
open daylight noun: broad daylight
open defecation noun: The human practice of defecating outside rather than into a toilet.
open design noun: The collaborative design of things, especially of open source software, through use of publicly shared design information.
open diapason noun: A certain stop in an organ, in which the pipes or tubes are formed like the mouthpiece of a flageolet at the end where the wind enters, and are open at the...
open differential noun: A type of differential gear used in automobile construction, allowing for output shafts to have different angular velocity, while equalizing torque applied...
open door adjective, noun: An unrestricted means of admission or access.
open door policy noun: A policy or usual practice, by a person in authority, of permitting subordinates or constituents to visit his or her office unannounced and at any...
open doors noun, verb: To lead to opportunities or social advantages.
open e noun: The letter e pronounced as the open-mid front unrounded vowel.
open-ear adjective: Synonym of open-back (“partially covering the ear”).
open-eared adjective: Listening closely to something; attentive.
open-earedness noun: The state of being open-eared; a willingness or interest in listening to new styles of music.
open-end fund noun: A collective investment scheme which can issue and redeem shares at any time.
open-end spinning noun: A technology for forming yarn without using a spindle.
open-ended adjective: Unrestricted by definite limits.
open-ended contract noun: Employment contract without a set date for termination.
open-ended question noun: Synonym of open question
open ended straight draw noun: Four cards to a straight where cards of two different ranks could complete a straight. (E.g. 4-5-6-7)
open-endedly adverb: In an open-ended manner; indefinitely; freely.
open-endedness noun: the state or quality of being open-ended
open-ender noun: Synonym of open ended straight draw.
open enrollment noun: Synonym of open admission (“type of college admissions process”).
open enrolment noun: UK standard spelling of open enrollment.
open evangelical noun: A person who takes the approach of open evangelicalism.
open evangelicalism noun: An approach that attempts to uphold evangelical doctrines, morality, and spirituality while also being inclusive of others.
open evening noun: An evening event where prospective students and parents/guardians are invited to a school.
open-eyed adjective: Alert and vigilant.
open-face adjective: Composed of a single slice of bread or other base with a topping.
open-faced adjective: Being a single slice of bread with a topping.
open-faced sandwich noun: Synonym of open sandwich
open fan noun: unducted fan, propfan
open feedwater heater noun: A feedwater heater in which the two fluid streams mix together.
open field adjective, noun: A large, unobstructed area of land with minimal cover, exposing troops to potential enemy fire with little opportunity to hide or take cover.
open-field system noun: The prevalent agricultural system in much of Europe during the Middle Ages, in which each manor or village had two or three large fields divided into narrow...
open-field test noun: A scientific test to gauge an animal's locomotor activity levels, anxiety, and willingness to explore, by placing the animal in an enclosed arena and...
open file noun: A file with no pawns of either color situated on it.
open fire noun, verb: An uncovered fire.
open floor plan noun: An interior of a building constructed with few walls or obstructions, giving a communal aspect.
open flue noun: A flue that draws air from the room in which the appliance it is connected to is located in.
open fracture noun: A fracture of a bone where one or more bone fragments penetrate the skin, forming an open wound.
open game noun: A chess opening characterized by the moves 1.e4 e5, in which both White and Black move their king's pawn to the fourth rank with their first move.
open goal noun: An undefended goal.
open half space noun: A half space that does not include the plane that bounds it
open-hand verb: To perform an action using an open hand.
open-handed adjective, adverb, verb: Done with the hand open rather than clenched
open-handedly adverb: In an open-handed manner.
open-handedness noun: The state or quality of being open-handed.
open harp noun: Synonym of angle harp.
open-heart surgery noun: A surgical operation on the heart done though a large incision in the chest.
open-hearted adjective: Frank and candidly straightforward
open-heartedly adverb: Frankly, honestly and sincerely.
open-heartedness noun: Frankness; candor and sincerity.
open hearth adjective, noun: Describing a reverberatory furnace used to make steel, usually in mass-produced quantities.
open house noun: A house habitually kept open to callers.
open housing noun: The policy by which a person's background (e.g. race or religion) may not be considered as a factor in whether to sell them a property.
open index noun: index (on a tensor) that isn't summed over
open interest noun: The total number of contracts outstanding between market participants in a market for futures, options, or other derivatives.
open Internet noun: The Internet without censorship and moderation.
open interval noun: An interval in the real number line which does not contain its supremum and infimum. If specified by a pair of real numbers, then it consists of all the...
open invitation noun: An invitation to visit someone or perform a given action at any time.
open it up verb: To speed up; to gun it.
open its doors verb: To begin operating.
open jaw noun: A fare construction where the destination is not the same as the origin point for the return, or where the origin differs from the return destination.
open justice noun: A legal principle requiring judicial proceedings to be conducted in a transparent manner and with the oversight of the people, so as to safeguard the rights...
open-kneed adjective: Having wide legs and reaching below the knees but higher than the ankles (not tied or closed at the knees).
open-kneed breeches noun: Wide-legged breeches ending below the knee.
open letter noun: A letter addressed to one person, or more, but published (as for example in a newspaper) for the public to read.
open-loop adjective: Any system that does not use feedback.
open market noun: Synonym of free market.
open marriage noun: A marital relationship in which both partners mutually agree that each is free to have sexual relationships with other people as they choose.
open matte adjective: Of a soft matte film, transferred to a home video format with the full frame exposed, thus having the theatrical mattes removed.
open media noun: Digital media, such as audiovisual materials, that can be shared freely without commercial restrictions.
open mic noun: A music, poetry, or comedy stage platform with open invitation, that is, where anyone is invited to perform.
open-mid adjective: pronounced with the tongue in a position approximately one-third of the way between an open and a close vowel
open mind noun: A mind willing to consider new ideas.
open-minded adjective /ˈəʊ.pən ˈmaɪn.dɪd/: Willing to consider new and different concepts, ideas, or opinions.
open-mindedly adverb: In an open-minded manner.
open-mindedness noun: The characteristic of being open-minded.
open morning noun: A morning on which an establishment (such as a school or business) is open to the public, allowing visitors to view the premises and learn about the...
open-mouthed adjective: With the mouth open.
open-neck adjective: Open at the neck.
open-necked adjective: Synonym of open-neck.
open-note adjective: Alternative form of open-notes.
open-notes adjective: Synonym of open-book (“referring to exams in which external resources such as textbooks, glossaries, study notes, calculators, etc. may be used”).
open o noun: The letter o pronounced as the open-mid back rounded vowel.
open ocean noun: Synonym of high seas
open one's big mouth verb /ˈəʊ̯.pən ˌwʌnz bɪɡ‿maʊ̯θ/: To speak about things rashly or foolishly, when it would be better to stay silent.
open one's bowels verb: To defecate.
open one's heart verb: To speak honestly and vulnerably about one's feelings.
open one's legs verb: Synonym of put out (consent to having sex).
open one's mind verb: To become receptive to new ideas and perspectives.
open one's mouth verb: to speak
open order noun: A military unit formed up so as to allow space between its ranks.
open out verb: To expand, to widen, to unwrap, unfold or uncover, to spread out from a compact state.
open outcry noun: A trading method whereby traders gather in person, often in a pit, and call out to all their desire to buy or sell a quantity at a given price, transactions...
open outsourcing noun: Crowdsourcing.
open Pandora's box verb: To perform an action that causes problems to appear which did not exist beforehand, or were not known about prior.
open-pit mine noun: A type of mine where rock or minerals are extracted from the earth by their removal from an open pit or borrow.
open-pittable adjective: Capable of being mined using the open-pit method.
open-plan adjective: Having large rooms with few dividing barriers such as partitions.
open-plan kitchen noun: A kitchen without walls separating it from the rest of house. Typically, this includes the dining room and living room, and is often collectively called the...
open play noun: The period of play outside set pieces; the phase where possession can change by passing and tackling.
open position noun: An active trade with unrealized profits and losses that has not yet been offset (“closed”) by a corresponding equivalent deal.
open prison noun: A prison with minimal restrictions on the prisoners.
open problem noun: A problem that has been posed in a field of study such as mathematics or theoretical computer science, but whose answer is not yet known.
open proxy noun: A proxy server that may be accessed by any Internet user.
open proxy server noun: a proxy server that may be accessed by any Internet user
open question noun: A type of question that cannot be answered with a simple yes or no and requires a longer, more detailed response.
open rate noun: A measure used by marketers as an indication of how many people "view" or "open" the electronic mail they send out.
open razor noun: Synonym of straight razor.
open reading frame noun: A sequence of DNA triplets, between the initiator and terminator codons, that can be transcribed into mRNA and later translated into protein.
open rectangle noun: A rectangle in the real plane which is an open set: i.e., which does not contain its edges. If the sides of the open rectangle are parallel to the plane's...
open relationship noun: A romantic or sexual relationship in which all parties mutually consent to the possibility of engaging in additional concurrent romantic or sexual...
open road adjective, noun: The part of the road system that is away from urban and suburban areas and on which large distances can be travelled without needing to frequently slow for...
open rotor noun: propfan, unducted fan
open sandwich noun: Any dish consisting of only one slice of bread, with any topping.
open sea noun: That part of the sea out of sight of land.
open season noun: A period of time during the calendar year when authorities within a jurisdiction permit the unrestricted hunting of one or more kinds of animal wildlife.
open seating noun: The provision of seating or tables without reservations.
open secret noun: Information that is widely known, but not acknowledged openly.
open sesame noun, phrase: open up (especially referring to doors)
open set noun: Informally, a set such that the target point of a movement by a small amount in any direction from any point in the set is still in the set; exemplified by...
open shop noun, verb: A place of employment in which employment is in no way contingent on membership in a union, though a union may be the exclusive bargaining agent of the...
open-shopper noun: One who supports, promotes, or operates an open shop (type of employment situation).
open-side noun: the portion of the field which is larger as measured from a scrum or breakdown to the touchline
open slather noun: Freedom to act without repercussions; free rein.
open someone's eyes verb: To make someone aware of something they did not know or fully understand before; to enlighten someone.
open source adjective, noun, verb /ˈəʊpən ˌsɔːs/: Of or relating to software where the source code is freely available and licensed in a manner that permits modification and redistribution.
open-sourceness noun: The quality of being open-source.
open sourceror noun: A programmer who works only on open source programs.
open space noun: An open-air area, such as a park or public garden with no (or very few) buildings, often in an urban area and designated by a local authority or government...
open species noun: A species of furry that is open source, not copyrighted by its creator; a fictional furry species that anyone is allowed to create and sell.
open sunshine noun: Total outdoor sunshine, without clouds, haze, or other obstruction.
open syllable noun: A syllable that has no coda after its nucleus, and which hence ends in a vowel.
open system noun: A system allowing hardware and software from different manufacturers to be used together seamlessly.
open table noun: The practice of some Protestant churches of allowing all people to take Communion, regardless of whether they are members of the church.
open texture noun: A philosophical concept that refers to the universal possibility of imprecision in empirical statements.
open-textured adjective: porous
open the attack verb: Used other than figuratively or idiomatically: see open, attack: to begin attacking, to commence battle.
open the ball verb: To begin operations; to set things in motion.
open the batting verb: To be one of a pair of cricketers (batsmen) that start a side's innings, who are also known as the opening pair or openers.
open the door verb: Used other than figuratively or idiomatically: see open, door.
open the face verb: To turn the face of the bat outwards in order to hit the ball on the off side.
open the floodgates verb: To allow some action to proceed more swiftly or to a greater extent.
open the kimono verb: To reveal confidential information, especially details of one's business operations.
open the range verb: To draw oneself or one's vehicles (warships, tanks, aircraft, etc.) out of range of the enemy's fire.
open the schools interjection: Expressing that someone is wrong or misinformed, especially where something should be widely understood (e.g. learned in school) but is not.
open the way verb: Synonym of prepare the ground
open time noun: The period of time after an adhesive has been applied and allowed to dry, during which an effective bond can be achieved by joining the two surfaces.
open-toed adjective: Synonym of opened-toe (in all senses)
open-top adjective: Having an open top.
open-top bus noun: A double-deck bus with an open, or partially open, top deck.
open-topped adjective: Synonym of open-top.
open-topper noun: A double-deck bus with an open, or partially open, top deck.
open tuning noun: A tuning of a guitar or other stringed instrument in which the strings sound a chord when strummed together without being pressed against the fretboard.
open up verb: To open.
open up the kimono verb: Alternative form of open the kimono.
open valley noun: a method of valley construction in which the steep-slope roofing on both sides are trimmed along each side of the valley, exposing the metal valley flashing.
open verdict noun: A verdict upon an inquest which finds that a crime has been committed without specifying the criminal.
open visit noun: A visit by a member of the public to a prisoner during which physical contact is permitted.
open wagon noun: An uncovered vehicle used for goods that do not need protection from the weather, although tarpaulins can be used to cover the load.
open wash noun, verb: Alternative form of openwash.
open washing noun, verb: Alternative form of openwashing.
open water noun: An expanse of an ocean, sea, or large lake which is distant from shore and devoid of nearby islands or other obstructions.
open-weight adjective: Based on open weights.
open weights noun: Publicly released model parameters of a trained neural network, allowing others to run or further adapt the model.
open wheel adjective: Alternative form of open-wheel.
open-wheel racing noun: Synonym of formula racing.
open wide verb: To open one's mouth wide, to gape.
open-work noun: Alternative form of openwork.
open world noun /ˌəʊp(ə)n ˈwɜːld/: A gameworld that the player may traverse freely, rather than being restricted to certain predefined areas and quests.
open wound noun: A wound which pierces the skin (and/or exterior bones), so as to bare flesh and/or internal organs.
openability noun: The quality of being openable.
openable adjective: Capable of being opened.
openband adjective: Right-handed or "Z shaped", with individual fibers pointing up and to the right when the thread, yarn, or rope is vertical.
openbill noun /ˈəʊpn̩.bɪl/: Either of two species of bird in the genus Anastomus of the stork family Ciconiidae, with a distinctive gap between the mandibles of the closed bill.
OpenBSD proper noun: a Unix-like operating system that is derived from Berkeley Software Distribution (BSD)
opencast adjective: Of or pertaining to strip mining, in which material is removed from a surface that has been exposed
OpenCourseWare proper noun: A body of academic materials released online, free of charge and open for use worldwide.
OpenDocument proper noun: A standard file format, based on XML, for office applications.
opened adjective, verb /ˈoʊpənd/: Having undergone opening.
opened-toe adjective: that leaves toes uncovered
opener adjective, noun /ˈəʊ.pən.ə/: A person who opens something.
OpenGL proper noun: Open Graphics Library: a standard, cross-platform specification for generating 2D and 3D computer graphics.
openhand verb: To hit with an open hand.
openhanded adjective, adverb, verb: Done with an open hand.
openhandedly adverb: Alternative form of open-handedly.
openhandedness noun: Alternative form of open-handedness.
openhearted adjective: Alternative form of open-hearted.
openheartedly adverb: Alternative form of open-heartedly.
openheartedness noun: Alternative form of open-heartedness.
opening adjective, noun, verb /ˈəʊ.pə.nɪŋ/: Pertaining to the start or beginning of a series of events.
opening argument noun: In adversarial legal systems, a statement made by either party at the beginning of a trial or comparable factfinding proceeding, in which that party lays...
opening batsman noun: The first batsman of an innings.
opening book noun: A book describing chess openings or giving general opening advice.
opening ceremony noun: A ceremony to mark the official opening of a building or event.
opening credits noun: The credits shown at the beginning of a film, TV program, etc.
opening goal noun: The first goal or point scored.
opening gun noun: The initial event that triggers a subsequent chain of events.
opening hours noun: The regular times of day when a shop, office or similar is open to the public.
opening move noun: A move that is used to start a game such as chess.
opening night noun: The first night, evening, or day of a spectacle or show.
opening of an envelope noun: Any kind of event or activity that may contribute to one's self-promotion or visibility in society.
opening sequence noun: Synonym of title sequence
opening speech noun: In adversarial legal systems, a statement made by either party at the beginning of a trial or comparable factfinding proceeding, in which that party lays...
opening statement noun: In adversarial legal systems, a statement made by a party at the beginning of a trial or comparable factfinding proceeding, in which that party lays out...
opening time noun: The time of day when a business, office, school, etc., opens to the public.
opening titles noun: Synonym of opening credits.
openly adverb /ˈoʊpənli/: In an open manner; visibly.
openminded adjective: Alternative spelling of open-minded.
openmindedly adverb: Alternative form of open-mindedly.
openmindedness noun: Alternative form of open-mindedness.
openmouthed adjective: Alternative form of open-mouthed.
openmouthedly adverb: With the mouth open, especially in astonishment.
openmouthedness noun: The state of having the mouth open, especially in astonishment.
openness noun: Accommodating attitude or opinion, as in receptivity to new ideas, behaviors, cultures, peoples, environments, experiences, etc., different from the...
Openshaw proper noun: A suburb of the City of Manchester, Greater Manchester, England (OS grid ref SJ8897).
openside noun: The space on the side of the pitch with the larger distance between the breakdown/set piece and the touchline.
openside flanker noun: a forward position in rugby union, usually number 7.
opensider noun: openside flanker
opensource adjective: Alternative spelling of open-source.
openture noun: Refraining from seeking a resolution or ending for an emotionally difficult experience.
OpenType proper noun /ˈəʊpənˌtaɪp/: A file format, developed jointly by Microsoft Corporation and Adobe Inc., for storing computer fonts.
openwash verb: To market something as open (without proprietary licensing) when it does not meet all the criteria of openness.
openwashing noun, verb: The act of claiming something is open (without proprietary licensing) when it does not meet all the criteria of openness.
openwork noun /ˈəʊpənwɜː(ɹ)k/: Any of several forms of metalwork or needlework having decorative openings.
openwork stocking noun: A type of stocking having decorative gaps in the fabric.
opepe noun: Synonym of bilinga (tropical hardwood)
opephoroid adjective: Relating to or characteristic of diatoms of the genus Opephora.
oper noun: A network operator on IRC.
opera noun /ˈɒp.ə.ɹə/: A theatrical work, combining drama, music, song and sometimes dance; usually, one sung-through, based on classical music and seen as more artistic and...
opera bouffe noun /ˌɒp(ə)ɹəˈbuːf/: Alternative form of opera bouffe.
opera buffa noun: A form of Italian comic opera popular in the 18th century.
opera cake noun: A French cake made with layers of almond sponge soaked in coffee syrup, layered with ganache and coffee buttercream, and covered in a chocolate glaze.
opera cloak noun: An elegant cloak for carrying into the auditorium of a theatre or opera house as a protection against draughts.
opéra comique noun: An opera, or genre of opera, characterised by spoken dialogue interspersed between the arias and ensemble numbers.
opera glass noun: A pair of small low-powered binoculars for use at a theatrical performance.
opera glasses noun: One or more pairs of small low-powered binoculars for use by members of the audience at a theatrical performance.
opera glove noun: Synonym of evening glove.
opera-goer noun: Alternative form of operagoer.
opera hat noun: A kind of collapsible top hat.
opera house noun /ˈɑp.ɹə ˌhaʊ̯s/: A theatre, or similar building, primarily used for staging opera.
opera house trap noun: A particular type of crab pot with netting supported by two curved structures on top.
opera seria noun: Serious or noble opera.
opera singer noun: Someone who sings opera professionally.
opera slipper noun /ˌɒp.ə̯(ɹ).ə ˈslɪp.ə̯(ɹ)/: Synonym of opera pump.
opera window noun: A small porthole-sized side window in the C-pillar of certain cars, popular in the 1970s.
operability noun: The extent to which a system or device is operable.
operable adjective /ˈɒ.pə.ɹə.bəl/: Able to be operated or used.
operably adverb: Such that it allows an operation to take place.
operad noun: A set of operations, each one having a fixed finite number of arguments and one output, which can be composed with others.
operadic adjective: Of or pertaining to operads.
operafication noun: The act or process of operafying.
operafy verb: To make into an opera or into the style of an opera; to make operatic.
operagoer noun: Someone who attends an opera performance
operagoing adjective: Attending opera performances.
operalike adjective: Resembling or characteristic of opera.
operalogue noun: A simplified film version of an opera.
operameter noun: An instrument or machine for measuring work done, especially the number of rotations by a machine or wheel in manufacturing cloth.
operance noun: operation; workings (the act of operating or working)
operancy noun: The quality of being operative.
operand noun /ˈɒpəɹænd/: A quantity to which an operator is applied (in 3-x, the operands of the subtraction operator are 3 and x).
operandum noun: A lever, key or device installed in an operant chamber, upon which the "subject" exerts its responses. Sometimes referred to as a manipulandum. In the...
operant adjective, noun: That operates to produce an effect.
operant conditioning noun: A technique of behavior modification through positive and negative reinforcement and positive and negative punishment.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0): each word's first meaning. A word with a page of its own links to it; for the rest, this line is PlainSpell's entry. Total under O: 20,049 words, in 67 parts.