- to and upon; to a position on
- Slang aware of or familiar with; esp., aware of the real nature or meaning of: they're onto our schemes
Onto is defined as to or upon.
An example of onto is someone jumping from the top of one rock to another.
- being, existence: ontology
- organism: ontogeny
Also, before a vowel, ont-
Origin of onto-from Classical Greek ?n (gen. ontos), present participle of einai, to be from Indo-European base an unverified form es- from source is
- On top of; to a position on; upon: The dog jumped onto the chair.
- Informal Fully aware of; informed about: The police are onto the robbers' plans.
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.
- Existence; being: ontology.
- Organism: ontogeny.
Origin of onto-Late Greek from Greek ōn ont- present participle of einai to be ; see es- in Indo-European roots.
- She climbed onto the vehicle and settled on the soft cushion.
- He tossed the hourglass onto a chair.
- She gave him an agitated look and rolled onto her stomach, twisting her head away from him.
- The man in the executioner uniform dumped her onto a familiar surgical table in a room that stank of blood.
- He rolled onto his side.