retaliatio

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
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. 
    

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