RETALIATION. The act by which a nation or individual treats another in the same manner that the latter has treated them. For example, if a nation should lay a very heavy tariff on American goods, the United States would be justified in return in laying heavy duties on the manufactures and productions of such country. Vatt. Dr. des Gens, liv. 2, c. 18, Sec. 341. Vide Lex talionis.