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Related to onto-: hold onto
1. Existence; being: ontology.
2. Organism: ontogeny.
existence or being: ontogeny; ontology.
[from Late Greek, from ōn (stem ont-) being, present participle of einai to be]
on•to(ˈɒn tu, ˈɔn-; unstressed ˈɒn tə, ˈɔn-)
1. to a place or position on; upon; on.
2. Informal. aware of the true nature, motive, or meaning of: I'm onto your tricks.adj.
3. Math. 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”: ontogeny.
[< New Latin < Greek]