onto

[on-too, awn-; unstressed on-tuh, awn-]
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

on, onto, on to.
Dictionary.com Unabridged

onto-

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


Origin:
< Neo-Latin < Greek ont- (stem of ón, neuter present participle of eînai to be) + -o- -o-

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
onto or on to (ˈɒntʊ, (unstressed) ˈɒntə, ˈɒntʊ, (unstressed) ˈɒntə)
 
prep
1.  to a position that is on: step onto the train as it passes
2.  having become aware of (something illicit or secret): the police are onto us
3.  into contact with: get onto the factory
 
usage  Onto is now generally accepted as a word in its own right. On to is still used, however, where on is considered to be part of the verb: he moved on to a different town as contrasted with he jumped onto the stage
 
on to or on to
 
prep
 
usage  Onto is now generally accepted as a word in its own right. On to is still used, however, where on is considered to be part of the verb: he moved on to a different town as contrasted with he jumped onto the stage

onto-
 
combining form
existence or being: ontogeny; ontology
 
[from Late Greek, from ōn (stem ont-) being, present participle of einai to be]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
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, © 2010 Douglas Harper
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American Heritage
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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Slang Dictionary

onto (so/sth) definition


  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 Education.
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FOLDOC
Computing Dictionary

onto definition


surjection

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Slide a whole salmon fillet onto the grill, along with vegetable skewers.
And perhaps now another box can be checked: the practice of bribing one's way
  onto the charts.
Early whales plied the shallows but still hauled themselves onto shore,
  probably to rest and to give birth.
Yahoo isn't happy that a detailed menu of the spying services it provides law
  enforcement agencies has leaked onto the web.
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