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[plee-uh-naz-uh m] /ˈpli əˌnæz əm/
the use of more words than are necessary to express an idea; redundancy.
an instance of this, as free gift or true fact.
a redundant word or expression.
Origin of pleonasm
1580-90; < Late Latin pleonasmus < Greek pleonasmós redundancy, surplus, derivative of pleonázein to be or have more than enough, itself derivative of pleíōn more (see pleo-)
Related forms
pleonastic, adjective
pleonastically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for pleonasm


noun (rhetoric)
the use of more words than necessary or an instance of this, such as a tiny little child
a word or phrase that is superfluous
Derived Forms
pleonastic, adjective
pleonastically, adverb
Word Origin
C16: from Latin pleonasmus, from Greek pleonasmos excess, from pleonazein to be redundant
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 pleonasm

"redundancy in words," 1580s, from Late Latin pleonasmus, from Greek pleonasmos, from pleonazein "to be more than enough, to be superfluous," in grammatical use, "to add superfluously," from comb. form of pleon "more" (see pleio-).

Online Etymology Dictionary, © 2010 Douglas Harper
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pleonasm in Medicine

pleonasm ple·o·nasm (plē'ə-nāz'əm)
An excess in the number or size of parts.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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