suppletion
noun/səˈpliːʃn/
/səˈpliːʃn/
[uncountable] (linguistics)- 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’.
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suppletion