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idempotent

[ahy-duh m-poht-nt, id-uh m-] /ˈaɪ dəmˈpoʊt nt, ˈɪd əm-/ Mathematics
adjective
1.
unchanged when multiplied by itself.
noun
2.
an idempotent element.
Origin of idempotent
1865-1870
First recorded in 1865-70; idem + potent1
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for idempotent

idempotent

/ˈaɪdəmˌpəʊtənt; ˈɪd-/
adjective
1.
(maths) (of a matrix, transformation, etc) not changed in value following multiplication by itself
Word Origin
C20: from Latin idem same + potent1
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 idempotent

1870, from Latin idem "the same" + potentem "powerful" (see potent).

Online Etymology Dictionary, © 2010 Douglas Harper
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