| omicron | (noun) the 15th letter of the Greek alphabet | - |
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| ominous | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, minatory, sinister, threatening |
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| (adjective) presaging ill fortune | Synonyms: ill, inauspicious |
| ominously | (adverb) in an ominous manner | - |
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| ominousness | (noun) The quality of giving indication of a coming ill; being an evil omen; being threatening, portentous, inauspicious. | - |
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| omissible | (adjective) capable of being left out | - |
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| omission | (noun) a mistake resulting from neglect | Synonyms: skip |
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| (noun) neglecting to do something; leaving out or passing over something | - |
| (noun) any process whereby sounds or words are left out of spoken words or phrases | Synonyms: deletion |
| (noun) something that has been omitted | - |
| omissive | (adjective) characterized by omissions | - |
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| omit | (verb) leave undone or leave out | Synonyms: drop, leave out, miss, neglect, overleap, overlook, pretermit |
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| (verb) prevent from being included or considered or accepted | Synonyms: except, exclude, leave off, leave out, take out |