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The use of an unrelated form to complete a paradigm, as the past tense went of the verb go, goes, going, gone.
[From Latin supplētus, past participle of supplēre, to supply; see supply.]
(Linguistics) 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]
supˈpletive n, adj
the use in inflection or derivation of a form that is not related to the primary form of a word, as the use of better as the comparative of good or went as the past tense of go.
[1275–1325; Middle English: completion < Medieval Latin supplētiō= Latin supplē(re) (see supplement) + -tiō -tion]
sup•ple•tive (səˈpli tɪv, ˈsʌp lɪ tɪv) adj.