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subtraction

[suh b-trak-shuh n]
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noun
  1. an act or instance of subtracting.
  2. Mathematics. the operation or process of finding the difference between two numbers or quantities, denoted by a minus sign (−).
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Origin of subtraction

1350–1400; Middle English < Late Latin subtractiōn- (stem of subtractiō) a withdrawing, equivalent to subtract(us) (see subtract) + -iōn- -ion
Related formsnon·sub·trac·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for subtraction

subtraction

noun
  1. the act or process of subtracting
  2. a mathematical operation in which the difference between two numbers or quantities is calculated. Usually indicated by the symbol (–)
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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

Word Origin and History for subtraction

n.

c.1400, "withdrawal, removal," from Late Latin subtractionem (nominative subtractio) "a drawing back, taking away," from past participle stem of Latin subtrahere "take away, draw off," from sub "from under" (see sub-) + trahere "to pull, draw" (see tract (n.1)). The mathematical sense is attested from early 15c.

Þou most know þat subtraccion is drawynge of one nowmber oute of anoþer nomber. ["The Crafte of Nombrynge," c.1425]
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Online Etymology Dictionary, © 2010 Douglas Harper

subtraction in Science

subtraction

[səb-trăkshən]
  1. The operation of finding the difference between two numbers or quantities.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.