
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 ...
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http://en.wikipedia.org/wiki/Suppletion

addition; supplement
Found on
http://phrontistery.info/s.html

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.
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https://www.infoplease.com/dictionary/suppletion

A form in a paradigm (a set of morphologically related elements, such as the forms of a verb or noun) which etymologically comes from another source, e.g. the past tense form went in English is not formally related to the verb go.
Found on
https://www.uni-due.de/ELE/LinguisticGlossary.html
No exact match found.