onto

Language: EN · Kind: word · Transcription: [/ˈɒn.tuː/]

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Senses

1. onto (prep) — sense 1

Definition: Arriving upon or on top of (speaking of a physical or metaphorical movement).

Example: My cat just jumped onto the keyboard.

2. onto (prep) — sense 2

Definition: Aware of.

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

3. onto (prep) — sense 3

Definition: 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.

4. onto (adj) — sense 4

Definition: Attaining each of the values in its codomain; having its image equal to its codomain.

Example: 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.

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