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Definition of Onto
1. prep. On the top of; upon; on. See On to, under On,
Definition of Onto
1. Preposition. Upon; on top of. ¹
2. Preposition. (informal) Aware of. ¹
3. Preposition. (mathematics) Being an onto function with a codomain of (see below). ¹
4. Adjective. (mathematics of a function) Assuming each of the values in its codomain; having its range equal to its codomain. ¹
¹ Source: wiktionary.com
Definition of Onto
1. to a position upon [prep]