suppletion

suppletion

[suh-plee-shuhn]
noun Grammar.
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; 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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World English Dictionary
suppletion (səˈpliːʃən)
 
n
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
 
[C14: from Medieval Latin supplētiō a completing, from Latin supplēre to supply1]
 
sup'pletive
 
n, —adj

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