onto

Noun

No noun senses have been added yet.

Verb

No verb senses have been added yet.

Adjective

onto adjective

1. (of a function) Assuming each of the values in its codomain; having its range equal to its codomain.“Considered as a function on the real numbers, the exponential function is not onto.”

Preposition

onto preposition

1. Upon; on top of.“My cat just jumped onto the keyboard.”
2. Aware of.“The thought-police were onto my plans of world domination.”
3. Being an onto function with a codomain of (see below).“The exponential function maps the set of real numbers onto the set of positive real numbers.”