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Dictionary Entries (6 more entries. View all »)
Dictionary.com Unabridged (v 1.1)Cite This Source
sub·trac·tion    Audio Help   [suhb-trak-shuhn] Pronunciation Key
–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 (−).
[Origin: 1350–1400; ME < LL subtractiōn- (s. of subtractiō) a withdrawing, equiv. to subtract(us) (see subtract) + -iōn- -ion]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopedia Articles (42 more entries. View all »)
Columbia Electronic EncyclopediaCite This Source


subtraction, fundamental operation of arithmetic; the inverse of addition. If a and b are real numbers (see number), then the number a-b is that number (called the difference) which when added to b (the subtractor) equals a (the subtrahend). In terms of addition the symbol -b is called the additive inverse of b with the property that the sum of a number and its inverse equals 0, or b+(-b)=0. It follows that -(-b)=b. The subtraction of b from a is the same as the addition of a and the inverse of b, or a-b=a+(-b); e.g., when a=10 and b=5, then 10-5=10+(-5). 
The Columbia Electronic Encyclopedia Copyright © 2004, Columbia University Press.
Licensed from Columbia University Press




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