onto.
Arriving upon or on top of (speaking of a physical or metaphorical movement).
Meaning & usage
Arriving upon or on top of (speaking of a physical or metaphorical movement).
My cat just jumped onto the keyboard.
A new drug has just come onto the market.
Aware of.
The thought-police were onto my plans of world domination.
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.
Where this word comes from
From on + to, after into. Compare Saterland Frisian antou (“up to”).
Attaining each of the values in its codomain; having its image equal to its codomain.
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.
Where this word comes from
From on + to, after into. Compare Saterland Frisian antou (“up to”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.