Definition of suppletion noun from the Oxford Advanced Learner's Dictionary



BrE BrE//səˈpliːʃn//
; NAmE NAmE//səˈpliːʃn//
[uncountable] (linguistics)
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the use of a word as a particular form of a verb when the word is not related to the main form of the verb, for example went as the past tense of go Word OriginMiddle English: from Old French, from medieval Latin suppletio(n-), from supplere ‘fill up, make full’, from sub- ‘from below’ + plere ‘fill’.
See the Oxford Advanced American Dictionary entry: suppletion