Of or pertaining to a lexicon, to lexicography, or words; according or conforming to a lexicon.

Relating to the lexicon, the set of all the morphemes of a language that is, broadly the collection of individual words which are available in the language community.

of or relating to words; "lexical decision task"

Pertaining to characters. A lexical analyzer is the same thing as a lexer. A lexical grammar is a grammar that defines the character patterns for the tokens of a language, such as numbers, identifiers, strings, etc.

Refers to the words or the vocabulary of a language as distinguished from its grammar and construction.

Pertaining to how the characters in source code are translated into tokens that the compiler can understand.

"Having to do with words, as in a lexical analysis of text."

In the lexicon of a language, lexical words or nouns refer to things.