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definition of the word onto

by the Wiktionnary


  1. upon, on top of
    • My cat just jumped onto the keyboard.
  2. (informal) aware of
    • The thought-police were onto my plans of World domination.
  3. (mathematics) 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.


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

Definition from Wiktionary
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