onto

preposition

on·to | \ ˈȯn-(ˌ)tü

, ˈän-\

Definition of onto

(Entry 1 of 2)

1 : to a position on We climbed onto the roof. Turn left onto Fifth Avenue.

2 : in or into a state of awareness about put me onto your methods was onto something that should have been pursued further— Bosley Crowther

3 —used as a function word to indicate a set each element of which is the image of at least one element of another set a function mapping the set S onto the set T

onto

adjective

Definition of onto (Entry 2 of 2)

: mapping elements in such a way that every element in one set is the image of at least one element in another set a function that is one-to-one and onto

Examples of onto in a Sentence

Preposition

We climbed onto the building's roof. The book fell onto the floor. The water spilled onto the floor. The cowboy leaped onto his horse. Transfer the data onto a disk. Turn left onto Third Street at the traffic light.