onto
Also surjective .Mathematics. pertaining to a function or map from one set to another set, the range of which is the entire second set.
Origin of onto
1Words that may be confused with onto
Other definitions for onto- (2 of 2)
a combining form meaning “being,” used in the formation of compound words: ontogeny.
Origin of onto-
2- Also especially before a vowel, ont-.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use onto in a sentence
Mr. Hartley smiles to himself as he disappears in the wings; he is "on-to" the little tricks of stars and leading ladies.
My Actor-Husband | Anonymous
British Dictionary definitions for onto (1 of 2)
on to
/ (ˈɒntʊ, unstressed ˈɒntə) /
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
usage For onto
British Dictionary definitions for onto- (2 of 2)
existence or being: ontogeny; ontology
Origin of onto-
2Collins 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.
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