• synonyms


[ser-jek-shuh n]
noun Mathematics.
  1. onto function.
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Origin of surjection

1960–65; sur-1 + -jection, as in injection, projection, etc.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for surjection


  1. a mathematical function or mapping for which every element of the image space is a value for some members of the domainSee also injection (def. 5), bijection
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Derived Formssurjective, adjective

Word Origin

C20: from sur- 1 + -jection, on the model of projection
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

surjection in Science


  1. A function such that each member of its range is mapped onto by a member of the domain. Compare bijection injection.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.