What is the meaning of Lex?

To perform lexical analysis; to convert a character stream to a token stream as a preliminary to parsing.

A specific inflected form of a word; compare lexeme.

a proposition or motion for a law made to the people by a magistrate, a bill

a bill which has become a law, a law, a statute

a precept, regulation, principle, rule, mode, manner

a contract, agreement, covenant

a condition, stipulation

Alternative form of lax (salmon)

Used before a given name to form names, often informal, for certain laws.

cheek (part of the face)

Source: wiktionary.org