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

 

lexis

 noun
noun
BrE BrE//ˈleksɪs//
 
; NAmE NAmE//ˈleksɪs//
 
[uncountable](linguistics)
 
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all the words and phrases of a particular language synonym vocabulary Word Origin 1950s (denoting the wording in a piece of writing): from Greek, literally ‘word’, from legein ‘speak’.
See the Oxford Advanced American Dictionary entry: lexis