noun
the use of an entirely different word or root for different forms of a given word
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Suppletion is a linguistic phenomenon where an irregular form is used to fill in a gap in a paradigm.
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I never realized how common suppletion is in English until I started studying linguistics.
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Who knew that language could have such crazy suppletion going on?
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In a way, suppletion is like finding a shortcut in a maze of grammar rules.