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suppletion

[suh-plee-shuh n]
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noun Grammar.
  1. the use in inflection or derivation of an allomorph that is not related in form to the primary allomorph of a morpheme, as the use of better as the comparative of good.
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Origin of suppletion

1275–1325; Middle English: supplementation, supplement < Medieval Latin supplētiōn- (stem of supplētiō) a filling up, equivalent to supplēt(us), past participle of supplēre to make complete, (sup- sup- + plē-, stem of plēre to fill (see full1) + -tus past participle suffix) + -iōn- -ion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for suppletion

suppletion

noun
  1. the use of an unrelated word to complete the otherwise defective paradigm of a given word, as for example the use of went for the past tense of go
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Derived Formssuppletive, noun, adjective

Word Origin

C14: from Medieval Latin supplētiō a completing, from Latin supplēre to supply 1
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