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onto

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on⋅to

  [on-too, awn-; unstressed on-tuh, awn-]
Use onto in a Sentence
–preposition
1. to a place or position on; upon; on: to get onto a horse.
2. Informal. in or into a state of awareness about: I'm onto your scheme.
–adjective
3. 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:
1575–85; on + to
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onto-

 
a combining form meaning “being,” used in the formation of compound words: ontogeny.
Also, especially before a vowel, ont-.

Origin:
< NL < Gk ont- (s. of ón, neut. prp. of eînai to be) + -o- -o-
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To onto
on·to   (ŏn'tōō', -tə, ôn'-)   
prep.  

  1. On top of; to a position on; upon: The dog jumped onto the chair. See Usage Note at on.

  2. Informal Fully aware of; informed about: The police are onto the robbers' plans.

adj.   Mathematics
Of, relating to, or being a mapping such that every element of the target set referred to is the image of an element in the domain.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang Dictionary
onto (so/sth)

  1. mod.
    alerted to or aware of a deceitful plan or person. : Wilmer thought he was safe, but the fuzz was onto him from the beginning.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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Word Origin & History

onto 
1581, as on to, from on + to. Appeared much later than parallel into. As a closed compound (on analogy of into), first recorded 1715.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

onto- or ont-
pref.
Organism; being: ontogeny.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

onto
surjection

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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