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on the upgrade improving, rising, or gaining importance.
on the uptake in understanding, realizing, or grasping.
on the wagon (informal) refraining from drinking alcohol.
on the warpath seeking, preparing for, or fighting in a war or warlike conflict. [2 definitions]
on the whole all things considered; in general.
on the wrong tack pursuing an inappropriate or mistaken course of action; misguided.
ontic having true and ultimate existence.
on time at the correct time for an event that is planned.
on tiptoe standing or walking on the toes, esp. to proceed quietly or cautiously. [2 definitions]
onto to a position on or on top of. [2 definitions]
onto- existence; being. [2 definitions]
ontogeny the process of biological growth and development of a particular living organism. (Cf. phylogeny.)
ontological of or pertaining to the philosophical study of existence and the nature of reality.
ontological argument an a priori argument for the existence of God that asserts that existence is a perfection and that God is the most perfect being, and therefore that God must exist.
ontology the philosophical study of existence and the nature of reality.
on top at the highest point (of something), or on the uppermost surface (esp. of something that is tall). [3 definitions]
on top of in total control. [3 definitions]
onus an unwanted but necessary task; burden. [2 definitions]
on view in a place visible to the public; on display.
onward toward a point or position ahead, as in space or time. [2 definitions]
on welfare receiving public aid because of poverty, hardship, or need.