Definition of lexeme noun from the Oxford Advanced Learner's Dictionary

 

lexeme

 noun
noun
BrE BrE//ˈleksiːm//
 
; NAmE NAmE//ˈleksiːm//
 
(also lexical unit)(linguistics) Linguistic devices
 
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a word or several words that have a meaning that is not expressed by any of its separate parts See related entries: Linguistic devices Word Origin 1940s: from lexicon + -eme.
See the Oxford Advanced American Dictionary entry: lexeme