suppletion

 
Pronunciation: /səˈpliːʃ(ə)n/

noun

[mass noun] Linguistics
  • the occurrence of an unrelated form to fill a gap in a conjugation (e.g. went as the past tense of go).

Derivatives

suppletive

adjective

Origin:

Middle English: from Old French, from medieval Latin suppletio(n-), from supplere 'fill up, make full' (see supply1)