Lex \Lex\ (l[e^]ks), n.; pl. Leges (l[=e]"j[=e]z). [L. See Legal.]

Law; as, lex talionis, the law of retaliation; lex terr[ae], the law of the land; lex fori, the law of the forum or court; lex loci, the law of the place; lex mercatoria, the law or custom of merchants.

Source: Webster's Revised Unabridged Dictionary (1913)