- to a place or position on; upon; on: to get onto a horse.
- in or into a state of awareness about: I'm onto your scheme.
- pertaining to a function or map from one set to another set, the range of which is the entire second set.
- a combining form meaning “being,” used in the formation of compound words: ontogeny.
- to a position that is on
- having become aware of (something illicit or secret)
- into contact with
- existence or being
