| Lex (n.) Law; as, lex talionis, the law of retaliation; lex terrae, 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. Thesaurus Entries act, bill, bylaw, canon, decree, dictate, dictation, edict, enactment, form, formality, formula, formulary, institution, jus, law, legislation, measure, ordinance, ordonnance, prescript, prescription, regulation, rubric, rule, ruling, standing order, statute |