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An ELT Glossary : Allomorphs
Definition : a variant of a morpheme (the smallest possible part of a word that has meaning).
Examples :un- in- il- im- and ir- are all variants of
the negative adjective prefix and therefore allomorphs. Similarly long and
leng-, strong and streng- (as in length, strength), and the noun plural endings: -s, (cups) -es (buses), and -en (oxen).
Allomorphs are not interchangeable - ie we can't say *unpossible, * oxes or *cupen.