(of a function) Assuming each of the values in its codomain; having its range equal to its codomain. Example: Considered as a function on the real numbers, the exponential function is not onto.
Upon; on top of. Example: My cat just jumped onto the keyboard.
Aware of. Example: The thought-police were onto my plans of world domination.
Being an onto function with a codomain of (see below). Example: The exponential function maps the set of real numbers onto the set of positive real numbers.
All clues having "ONTO"
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You can find a list of possible crossword clues for ONTO below.