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omnipotent possessing infinite power; all-powerful. [3 definitions]
omnipresent existing in all places at any given time.
omniscient infinite in knowledge; all-knowing. [3 definitions]
omnium-gatherum a miscellaneous collection; miscellany.
omnivore an animal that feeds on both plants and animals.
omnivorous living on a diet of both plant and animal food. [3 definitions]
omophagia the eating of raw meat.
omphalos the navel or bellybutton. [2 definitions]
-on1 subatomic particle. [3 definitions]
-on2 used in naming inert gases.
-on3 a chemical compound that does not contain oxygen in a carbonyl group.
on above and supported by. [19 definitions]
on account of because of.
on a dime (informal) with great quickness, precision, or accuracy.
on and on at excessive length.
on an even keel well-balanced or stable.
onanism self-gratification, esp. masturbation. [2 definitions]
on approval for determination of satisfaction, without obligation to buy.
on a silver platter without having to expend effort; undeservedly.
on bail temporarily released from custody after bail is given.
once at one time in the past; formerly. [7 definitions]