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Occam's razor

noun
1.
the maxim that assumptions introduced to explain a thing must not be multiplied beyond necessity.
Origin
1900-1905
1900-05; after William of Occam
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Occam's razor

Occam's razor

noun
1.
a variant spelling of Ockham's razor

Ockham's razor

noun
1.
a maxim, attributed to William of Ockham, stating that in explaining something assumptions must not be needlessly multiplied Also called the principle of economy
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
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Word Origin and History for Occam's razor
Occam's razor
when two competing hypotheses explain the data equally well, choose the simpler. Named for Eng. philosopher William of Ockham (c.1285-c.1349).
Online Etymology Dictionary, © 2010 Douglas Harper
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Occam's razor in Science
Occam's razor or Ockham's razor
  (ŏk'əmz)   
A rule in science and philosophy stating that entities should not be multiplied needlessly. This rule is interpreted to mean that the simplest of two or more competing theories is preferable and that an explanation for unknown phenomena should first be attempted in terms of what is already known. Occam's razor is named after the deviser of the rule, English philosopher and theologian William of Ockham (1285?-1349?).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Occam's razor in Technology

philosophy
The English philosopher, William of Occam (1300-1349) propounded Occam's Razor:
Entia non sunt multiplicanda praeter necessitatem.
(Latin for "Entities should not be multiplied more than necessary"). That is, the fewer assumptions an explanation of a phenomenon depends on, the better it is.
For example, some claim that God caused himself to exist and also caused the universe to exist - he was the "first cause" - whereas Occam's Razor suggests that if one accepts the possibility of something causing itself then it is better to assume that it was the universe that caused itself rather than God because this explanation involves fewer entities.
The negation of Occam's Razor would suggest that an arbitrarily complex explanation is just as good as the simplest one. (E.g. God and his cat created a robot called Sparky who built the universe from parts bought from a shop in another dimension).
See also KISS Principle.
(1995-11-09)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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