suppletion

noun
sup·​ple·​tion | \sə-ˈplē-shən \

Definition of suppletion 

: the occurrence of phonemically unrelated allomorphs of the same morpheme (such as went as the past tense of go or better as the comparative form of good)

Other Words from suppletion

suppletive \ sə-​ˈplē-​tiv , ˈsə-​plə-​ \ adjective

First Known Use of suppletion

1909, in the meaning defined above

History and Etymology for suppletion

Medieval Latin suppletion-, suppletio act of supplementing, from Latin supplēre

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The first known use of suppletion was in 1909

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