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1. Maths of or relating to a number or quantity divided into one
2. Navigation denoting a course or bearing that is 180? from the previous or assumed one
3. Maths a number or quantity that when multiplied by a given number or quantity gives a product of one
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
a number whose product with a given number is equal to 1. For example, 5 and 1/5 are mutually reciprocal, as are —2/3 and —3/2. For any number a that is not equal to 0 there exists the reciprocal 1/a.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
The reciprocal of a number A is the number 1/ A.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.