onto

1 of 2

preposition

on·​to ˈȯn-(ˌ)tü 

ˈän-

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

2 of 2

adjective

: 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.

Recent Examples on the Web

Preposition

In the seventh, Fernando Tatis Jr. crushed a solo home run that sailed over the left field fence and onto the new two-story A’s club house, a 406-foot shot for a Padres 5-3 lead, and A’s ace Luis Severino dropped to 0-2 on the season despite an otherwise solid outing. —Joe Davidson, Sacbee.com, 8 Apr. 2025

At its southern end, the state highway turns west off Meridian Road at Kuna Road and onto East Avalon Street for less than three blocks before ending at Orchard. —Rose Evans, Idaho Statesman, 8 Apr. 2025

Herd, who has been a guide since 2015, walked us from Frontierland to Fantasyland and onto Tomorrowland, surprising us with treats such as Tiana’s beignets for a mid-morning snack and taking photos in front of the iconic Sleeping Beauty Castle, hitting just the right angle. —Jacqui Gifford, Travel + Leisure, 8 Apr. 2025

Some Kentucky cities and towns have seen inundation reach historic levels, as heavy rainfall caused major rivers to swell and spill over onto the land. —Emily Mae Czachor, CBS News, 8 Apr. 2025

Word History

First Known Use

Preposition

1581, in the meaning defined at sense 1

Adjective

1942, in the meaning defined above

Phrases Containing onto

• build onto
• fasten onto
• get on/onto the subject of
• get onto
• give onto
• latch onto
• lock onto
• map onto
• onto something
• project onto
• stumble across/on/onto/upon
• voted on/onto

Kids Definition

onto

preposition

on·​to

ˌȯn-tə,

ˌän-;

ˈȯn-tü,

ˈän-

1

: to a position on or against

leaped onto the horse

climbed onto the roof

2

: in a state of knowing about or becoming aware of

I'm onto their little game