Onto Definition

ŏnto͝o, -tə, ôn-
preposition
To and upon; to a position on.
Webster's New World
Aware of or familiar with; esp., aware of the real nature or meaning of.
They're onto our schemes.
Webster's New World
Onto is defined as to or upon.
An example of onto is someone jumping from the top of one rock to another.
YourDictionary

(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.
Wiktionary
adjective
Of, relating to, or being a function such that every element of the codomain is the value that corresponds to an element in the domain.
American Heritage
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prefix
Existence; being.
Ontology.
American Heritage
Organism.
Ontogeny.
American Heritage
affix
Being, existence.
Ontology.
Webster's New World
Organism.
Ontogeny.
Webster's New World

Origin of Onto

  • Late Greek from Greek ōn ont- present participle of einai to be es- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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