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suppletive

[suh-plee-tiv, suhp-li-tiv]
adjective Grammar.
  1. serving as an inflected form of a word with a totally different stem, as went, the suppletive past of go.
  2. including one or more such forms: a suppletive paradigm.
  3. characterized by the use of such forms: suppletive inflection.
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Origin of suppletive

1810–20; < Medieval Latin supplētīvus, equivalent to Latin supplēt(us) (past participle of supplēre to fill up; see suppletion) + -īvus -ive
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018