| one | (noun) a single person or thing | - |
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| (noun) the smallest whole number or a numeral representing this number | Synonyms: 1, ace, I, single, unity |
| 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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| onerousness | (noun) unwelcome burdensome difficulty | Synonyms: burdensomeness, heaviness, oppressiveness |
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