| obligation | (noun) the social force that binds you to the courses of action demanded by that force | Synonyms: duty, responsibility |
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| (noun) a legal agreement specifying a payment or action and the penalty for failure to comply | - |
| (noun) a written promise to repay a debt | Synonyms: certificate of indebtedness, debt instrument |
| (noun) a personal relation in which one is indebted for a service or favor | Synonyms: indebtedness |
| (noun) the state of being obligated to do or pay something | - |
| obligato | (noun) a part of the score that must be performed without change or omission | Synonyms: obbligato |
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| (noun) a persistent but subordinate motif | Synonyms: obbligato |
| obliger | (noun) someone who performs a service or does a favor | Synonyms: accommodator |
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| obligingness | (noun) a disposition or tendency to yield to the will of others | Synonyms: complaisance, compliance, compliancy, deference |
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| oblique | (noun) a diagonally arranged abdominal muscle on either side of the torso | Synonyms: abdominal external oblique muscle, external oblique muscle, musculus obliquus externus abdominis |
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| (noun) any grammatical case other than the nominative | Synonyms: oblique case |
| obliqueness | (noun) the property of being neither parallel nor perpendicular, but at a slanting angle | - |
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| (noun) the quality of being oblique and rambling indirectly | Synonyms: deviousness |
| obliquity | (noun) the quality of being deceptive | Synonyms: deceptiveness |
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| (noun) the presentation during labor of the head of the fetus at an abnormal angle | Synonyms: asynclitism |
| obliteration | (noun) destruction by annihilating something | Synonyms: annihilation |
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| (noun) the complete destruction of every trace of something | Synonyms: eradication |
| obliterator | (noun) an eliminator that does away with all traces | - |
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| oblivion | (noun) total forgetfulness | Synonyms: obliviousness |
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| (noun) the state of being disregarded or forgotten | Synonyms: limbo |
| obliviousness | (noun) total forgetfulness | Synonyms: oblivion |
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