Inflectional Suppletion

AKA: Suppletion.
See: Stem Word, Lexical Item, Linguistics, Etymology, Inflection, Cognate, Word Stem#Paradigms And Suppletion.

References

(Wikipedia, 2020) ⇒ https://en.wikipedia.org/wiki/Suppletion Retrieved:2020-3-12.
- In linguistics and etymology, suppletion is traditionally understood as the use of one word as the inflected form of another word when the two words are not cognate. For those learning a language, suppletive forms will be seen as "irregular" or even "highly irregular". The term "suppletion" implies that a gap in the paradigm was filled by a form "supplied" by a different paradigm. Instances of suppletion are overwhelmingly restricted to the most commonly used lexical items in a language.

(SIL, 2020) ⇒ https://glossary.sil.org/term/suppletion Retrieved:2020-3-12.
- QUOTE: Suppletion is the replacement of one stem with another, resulting in an allomorph of a morpheme which has no phonological similarity to the other allomorphs.

(Dicitionary.com, 2020) ⇒ https://www.dictionary.com/browse/suppletion Retrieved:2020-3-12.
- QUOTE: the use in inflection or derivation of an allomorph that is not related in form to the primary allomorph of a morpheme, as the use of better as the comparative of good.

(Bobaljik, 2015) ⇒ Jonathan David Bobaljik (2015). "Suppletion: Some Theoretical Implications". In: Annual Review of Linguistics (Vol. 1:1-18). DOI:10.1146/annurev-linguist-030514-125157
- QUOTE: Suppletion (wholly unpredictable alternations such as good∼better or go∼went) stands as the epitome of morphological irregularity. In the formal theoretical tradition, with a few exceptions, suppletion has long languished in obscurity, widely considered unlikely to be informative of deeper properties of grammar.

http://www.phon.ucl.ac.uk/home/dick/enc/morphology.htm#suppletion
- Suppletion is a morphological pattern (usually inflectional) in which one inflection has a stem which is different from the default one. For example, in English the default stem of GO is {go}, but this is replaced in GO:past by {wen} (to which the past-tense suffix {t} is added).