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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
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for occam razor

Occam's razor

noun
1.
a variant spelling of Ockham's razor
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for occam razor

Occam's razor

when two competing hypotheses explain the data equally well, choose the simpler. Or, as Sir William Hamilton puts it, "Neither more, nor more onerous, causes are to be assumed, than are necessary to account for the phenomena." Named for English philosopher William of Ockham or Occam (c.1285-c.1349), who expressed it with Entia non sunt multiplicanda praeter ncccssitatem.

So called after William of Occam (died about 1349): but, as a historical fact, Occam does not make much use of this principle, which belongs rather to the contemporary nominalist William Durand de St. Pourçain (died 1332). [Century Dictionary]

Online Etymology Dictionary, © 2010 Douglas Harper
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occam 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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