Of or relating to the vocabulary, words, or morphemes of a language.(adjective)
Of or relating to lexicography or a lexicon.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "lexical" in a sentence
"There seems to be nothing but confusion with regards to the intricacies of a language, or what the stuffy English major in me knows as lexical content words (nouns, verbs, adjectives, adverbs) and function words (pronouns, conjunctions, determiners, prepositions etc.) - something that seems to fly over the heads of most self-professed raw watchers, especially those who claim they don't need subtitles anymore."
"English isn’t derived from German, and New High German is quite a bit different in lexical structure from Modern English (Old High German is closer)."
"But nearly half of the new words are not included in any dictionary and are dubbed lexical"