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’.