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suppletion

[suh-plee-shuh n] /səˈpli ʃən/
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.
Origin
1275-1325
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
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for suppletion

suppletion

/səˈpliːʃən/
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
Derived Forms
suppletive, noun, adjective
Word Origin
C14: from Medieval Latin supplētiō a completing, from Latin supplēre to supply1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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