Onto meaning

ŏnto͝o, -tə, ôn-
Onto is defined as to or upon.

An example of onto is someone jumping from the top of one rock to another.

preposition
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Fully aware of; informed about.

The police are onto the robbers' plans.

preposition
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On top of; to a position on; upon.

The dog jumped onto the chair.

preposition
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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.
adjective
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Existence; being.

Ontology.

prefix
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Organism.

Ontogeny.

prefix
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To and upon; to a position on.
preposition
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Aware of or familiar with; esp., aware of the real nature or meaning of.

They're onto our schemes.

preposition
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Being, existence.

Ontology.

affix
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Organism.

Ontogeny.

affix
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Upon; on top of.

My cat just jumped onto the keyboard.

preposition
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(informal) Aware of.

(The thought-police were onto my plans of World domination.)

preposition
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(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.

preposition
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(mathematics, of a function) Assuming each of the values in its codomain; having its range equal to its codomain.

Considered as a function on the real numbers, the exponential function is not onto.

adjective
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Origin of onto

  • < Gr ōn (gen. ontos), prp. of einai, to be < IE base *es- > is

    From Webster's New World College Dictionary, 5th Edition

  • 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