| one | (adjective) used of a single unit or thing; not two or more | Synonyms: 1, ane, i |
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| (adjective) being a single entity made by combining separate components | - |
| (adjective) (informal) very; used informally as an intensifier | Synonyms: right |
| (adjective) eminent beyond or above comparison | Synonyms: matchless, nonpareil, one and only, peerless, unmatchable, unmatched, unrivaled, unrivalled |
| (adjective) indefinite in time or position | - |
| (adjective) of the same kind or quality | - |
| (adjective) having the indivisible character of a unit | Synonyms: unitary |
| (noun) a single person or thing | - |
| (noun) the smallest whole number or a numeral representing this number | Synonyms: 1, ace, I, single, unity |
| oneiric | (adjective) of or relating to or suggestive of dreams | - |
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| oneirism | (noun) absentminded dreaming while awake | Synonyms: air castle, castle in Spain, castle in the air, daydream, daydreaming, reverie, revery |
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| oneiromancer | (noun) someone who divines through the interpretation of dreams | - |
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| oneiromancy | (noun) divination through the interpretation of dreams | - |
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| oneness | (noun) the quality of being united into one | Synonyms: unity |
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| onerous | (adjective) not easily borne; wearing | Synonyms: burdensome, taxing |
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| onerously | (adverb) in an onerous manner | - |
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| onerousness | (noun) unwelcome burdensome difficulty | Synonyms: burdensomeness, heaviness, oppressiveness |
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| onetime | (adjective) belonging to some prior time | Synonyms: erstwhile, former, old, one-time, quondam, sometime |
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