| on | (adjective) in operation or operational | - |
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| (adjective) (of events) planned or scheduled | - |
| oncologic | (adjective) of or relating to or practicing oncology | Synonyms: oncological |
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| oncological | (adjective) of or relating to or practicing oncology | Synonyms: oncologic |
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| oncoming | (adjective) moving toward one | - |
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| 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 |
| oneiric | (adjective) of or relating to or suggestive of dreams | - |
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| onerous | (adjective) not easily borne; wearing | Synonyms: burdensome, taxing |
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| onetime | (adjective) belonging to some prior time | Synonyms: erstwhile, former, old, one-time, quondam, sometime |
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| ongoing | (adjective) currently happening | Synonyms: on-going |
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| online | (adjective) connected to a computer network or accessible by computer | Synonyms: on-line |
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| (adjective) on a regular route of a railroad or bus or airline system | Synonyms: on-line |
| (adjective) being in progress now | Synonyms: on-line |
| only | (adjective) exclusive of anyone or anything else | Synonyms: alone |
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| (adjective) being the only one; single and isolated from others | Synonyms: lone, lonesome, sole, solitary |
| onomastic | (adjective) of or related to onomastics | - |
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| onomatopoeic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeical, onomatopoetic |
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| (adjective) of or relating to or characterized by onomatopoeia | Synonyms: onomatopoetic |
| onomatopoeical | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeic, onomatopoetic |
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| onomatopoetic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeic, onomatopoeical |
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| (adjective) of or relating to or characterized by onomatopoeia | Synonyms: onomatopoeic |
| onshore | (adjective) (of winds) coming from the sea toward the land | Synonyms: inshore, shoreward |
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| (adjective) on the edge of the land | - |
| onside | (adjective) not offside; being within the prescribed area of play | - |
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| onstage | (adjective) situated or taking place on the area of a stage visible to the audience | - |
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| ontogenetic | (adjective) of or relating to the origin and development of individual organisms | - |
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| ontological | (adjective) of or relating to ontology | - |
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| onymous | (adjective) bearing a name | - |
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