Also surjective .Mathematics. pertaining to a function or map from one set to another set, the range of which is the entire second set.
Other definitions for onto- (2 of 2)
a combining form meaning “being,” used in the formation of compound words: ontogeny.
- Also especially before a vowel, ont-.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use onto in a sentence
For his part, Bratton is disappointed but not surprised that the same narrative is already being mapped onto Fry and Spencer.Freaking Out About Age Gaps in Gay Relationships Is Homophobic | Samantha Allen | January 9, 2015 | THE DAILY BEAST
So it might be me projecting my desires onto Archer to want to just get away from work for a few weeks.‘Archer’ Creator Adam Reed Spills Season 6 Secrets, From Surreal Plotlines to Life Post-ISIS | Marlow Stern | January 8, 2015 | THE DAILY BEAST
I was sick in street gutters, onto my desk, at dinners with friends.I Tried to Warn You About Sleazy Billionaire Jeffrey Epstein in 2003 | Vicky Ward | January 7, 2015 | THE DAILY BEAST
Gang tattoos are still inked onto his face, like scarlet letters.
Where these laser-like missiles are falling out of the sky onto a city and you have to stop each of them from hitting the targets?Coffee Talk with Ethan Hawke: On ‘Boyhood,’ Jennifer Lawrence, and Bill Clinton’s Urinal Exchange | Marlow Stern | December 27, 2014 | THE DAILY BEAST
I put down my haid, and was just kinda dragged up the aisle and onto the platform.Alec Lloyd, Cowpuncher | Eleanor Gates
His untidy hair was rumpled, as if someone had been hanging onto it while in the process of giving him the shiner.Fee of the Frontier | Horace Brown Fyfe
Either: we cannot give you what you ask, so fall back onto the defensive; or, go ahead, we will give you the means.Gallipoli Diary, Volume I | Ian Hamilton
But momentum was sufficient to carry Jeff Weedham's roadster out onto the road.
Black Hood let the clutch slap in and the roadster bounded back onto the tarvia drive.
British Dictionary definitions for onto (1 of 2)
to a position that is on: step onto the train as it passes
having become aware of (something illicit or secret): the police are onto us
into contact with: get onto the factory
British Dictionary definitions for onto- (2 of 2)
existence or being: ontogeny; ontology
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Other Idioms and Phrases with onto
see be on to.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.