English Words: O

15,494 words · Page 125 of 310

opera glovenoun

Synonym of evening glove.

opera hatnoun

A kind of collapsible top hat.

opera housenoun

A theatre, or similar building, primarily used for staging opera.

opera house trapnoun

A particular type of crab pot with netting supported by two curved structures on top.

opera serianoun

Serious or noble opera.

opera slippernoun

Synonym of opera pump.

opera-goernoun

Alternative form of operagoer.

operableadj

Able to be operated or used.

operablyadv

Such that it allows an operation to take place.

operadnoun

A set of operations, each one having a fixed finite number of arguments and one output, which can be composed with others.

operadicadj

Of or pertaining to operads.

operaficationnoun

The act or process of operafying.

operafiedverb

simple past and past participle of operafy

operafyverb

To make into an opera or into the style of an opera; to make operatic.

operagoernoun

Someone who attends an opera performance

operagoingadj

Attending opera performances.

operalikeadj

Resembling or characteristic of opera.

operameternoun

An instrument or machine for measuring work done, especially the number of rotations by a machine or wheel in manufacturing cloth.

operandnoun

A quantity to which an operator is applied (in 3-x, the operands of the subtraction operator are 3 and x).

operandumnoun

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 prototypical operant conditioning experiment, a rat (the subject) presses upon a lever (the operandum) which triggers the delivery of food (the reward or reinforcer).

operantadj

That operates to produce an effect.

operant conditioningnoun

A technique of behavior modification through positive and negative reinforcement and positive and negative punishment.

operantlyadv

In an operant manner

operaphilenoun

One who enthusiastically enjoys opera.

operaphobenoun

A person who hates opera.

operatableadj

Alternative form of operable.

operateverb

To perform a work or labour; to exert power or strength, physical or mechanical; to act.

operatedverb

simple past and past participle of operate

operateenoun

Someone who has an operation.

operaticadj

Of, related to, or typical of opera.

operaticallyadv

In an operatic manner.

operatingadj

In operation; that operates.

operating systemnoun

Software that is designed for controlling the allocation and the use of various hardware resources to tasks and remote terminals.

operating-roomnoun

Alternative form of operating room.

operating-room tablenoun

Alternative form of operating room table.

operationnoun

The method by which a device performs its function.

operationaladj

Of or relating to operations, especially military operations.

operational definitionnoun

A showing of something — such as a variable, term, or object — in terms of the specific process or set of validation tests used to determine its presence and quantity.

operational encirclementnoun

a situation of (partial) encirclement where the besieged forces are not yet in imminent danger of destruction or capture, but are unable to organize adequate defence for a longer period of time, especially in such a way that there remains a connection to the rear, which the enemy however can cover with precise artillery fire, severely hampering supply.

operational taxonomic unitnoun

A terminal node in phylogenetic analysis; an organism.

operationaliseverb

Alternative spelling of operationalize.

operationalismnoun

A philosophy that attempts to define all scientific concepts in terms of specified operations or procedures of observation and measurement.

operationalistnoun

A proponent of operationalism.

operationalisticadj

Of or pertaining to operationalism.

operationalitynoun

That characteristic of being operational.

operationalizabilitynoun

The state or characteristic of being capable of being operationalized.

operationalizableadj

Possible to operationalize; subject to operationalization.

operationalizationnoun

The act or process of operationalizing.

operationalizeverb

To make operational.

operationallyadv

In an operational manner; in accordance with an operation.

Spelling & Dictionary Insight

The English alphabetical index for the letter O contains 15,494 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 310 pages, and you are currently viewing page 125. Every row above is a dictionary-backed entry with a canonical slug, and each links through to a full definition page with pronunciation, senses, etymology, and related-word data where available.

On this page 50 of 50 entries carry a part-of-speech tag and 50 carry at least one stored definition. Coverage varies across letters because Wiktionary volunteers build entries at different speeds for different parts of the alphabet, letters with common starting sounds (S, C, T, P) usually have the densest coverage, while less frequent starters (X, Q, Z) tend to have shorter but more specialised lists. PlainSpell surfaces whatever data is present and links back to the source when a definition is not yet recorded.

For readers using this index as a spelling reference, the guarantee is that every form you see on the list is a documented English headword, not a guess, not a derived inflection lacking a lemma row. If a word you expected to find is absent from the "O" list, it usually means the form exists only as an inflection of another lemma (e.g. a past participle stored under the infinitive) or the entry has not yet been imported from Wiktionary. Use the search bar or the misspelling lookup to resolve these cases.