offlineadjOf a system, currently not connected (generally electrically) to a larger network. For example, a power plant which is not connected to the grid, or a computer which is not connected to the Internet or to any other communications service.
offloadingnounThe act by which something is offloaded.
offscreenadjExisting or happening outside the frame of the cinema or television screen
offsetnounAnything that acts as counterbalance; a compensating equivalent.
offsettingverbpresent participle and gerund of offset
offshootnounSomething which shoots off or separates from a main stem or branch of a plant.
offsideadjIn an illegal position ahead of the ball, puck, etc.
offsiteadjAway from a main location; in a place not owned by a particular organisation.
offspringnounA person's daughter or son; a person's child.
offstageadjOf or relating to that part of a stage not visible to the audience.
oficinanounA nitrate-producing factory in a Spanish-speaking country.
OfstednameAcronym of Office for Standards in Education, Children's Services and Skills: the non-ministerial government department of His Majesty's Chief Inspector of Schools In England (HMCI).
oftadvoften; frequently; not rarely
oftenadvFrequently; many times on different occasions.
OGnounInitialism of Original Gangsta; a person associated with the earliest era of gangsta rap.
oganounA chief, employer, or superior.
OgatanameA surname from Japanese.
OgawanameA surname from Japanese.
OgdennameA habitational surname from Old English.
OggnameAn open bitstream container file format for audio, video, and other multimedia content.
OgiernameA surname from French.
OgilvienameA surname from Scottish Gaelic.
OgilvynameA surname from Scottish Gaelic.
ogleverbTo stare at (someone or something), especially impertinently, amorously, or covetously.
oglingnounAction of the verb to ogle.
ogrenounA type of brutish giant from folk tales that eats human flesh.
OgunnameA male given name from Yoruba.
OHnounInitialism of other half: a husband, wife, partner, etc.
ohananounAn extended Hawaiian family unit.
OhaniannameA surname from Armenian.
OhionameA state of the United States. Capital and largest city: Columbus.
OhlnameA surname from German.
ohmnounIn the International System of Units, the derived unit of electrical resistance; the electrical resistance of a device across which a potential difference of one volt causes a current of one ampere.
ohnprepAlternative form of on (“without”).
ohointjExpressing surprise or gloating realisation; aha.
OHSnounInitialism of occupational health and safety.
oiintjSaid to get someone's attention; hey.
OIGnounInitialism of office of the inspector general.
oikosnounA basic societal unit in Ancient Greece; a household or family line.
oiledadjCovered in, or supplied with, oil.
oilernounOne who or that which oils.
oilfieldnounAlternative spelling of oil field.
Spelling & Dictionary Insight
The English alphabetical index for the letter O contains 1,431 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 29 pages, and you are currently viewing page 8. 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.