A lexical verb is a member of the open class of verbs which form the primary verb vocabulary of a language.
The adjective lexical is applied generally to the vocabulary of a language, especially to distinguish content words from function words.
(English)
The verb come in will be coming is a lexical verb.
Quirk, Randolph, S. Greenbaum, G. Leech, and J. Svartvik. 1985.A comprehensive grammar of the English language. London: Longman.
Mish, Frederick (editor). 1991.Webster's ninth new collegiate dictionary. Springfield, MA: Merriam-Webster. 1,564 pages. 0877795088; indexed 0877795096; deluxe 087779510X.
Crystal, David. 1985.A dictionary of linguistics and phonetics. 2nd edition. New York: Basil Blackwell.