noun.
The set of all words and phrases in a language.
noun.
The vocabulary used by a writer
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
all of the words in a language; all word forms having meaning or grammatical function
Word Usage
"Another possibility is that an innovation may represent a shift in the meaning of an older word previously in speakers 'lexis, which is sometimes prompted by new developments in social structure or technologies."