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Onto

//ˈɔn.tu// adj, prep, slang

Definitions

Adjective
  1. 1
    Attaining each of the values in its codomain; having its image equal to its codomain. not-comparable

    "Considered as a function on the real numbers, the exponential function is not onto, as it never takes on values less than or equal to zero."

Preposition
  1. 1
    Arriving upon or on top of (speaking of a physical or metaphorical movement).

    "My cat just jumped onto the keyboard."

  2. 2
    Aware of. informal

    "The thought-police were onto my plans of world domination."

  3. 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."

Etymology

Etymology 1

From on + to, after into. Compare Saterland Frisian antou (“up to”).

Etymology 2

From on + to, after into. Compare Saterland Frisian antou (“up to”).

See also for "onto"

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