re·tor·sion
or re·tor·tion (rĭ-tôr′shən)n. An act perpetrated by one nation upon another in retaliation or reprisal for a similar act perpetrated by the other nation.
[Probably French rétorsion, from Latin retortus (influenced by Late Latin torsiō, a twisting, wringing), past participle of retorquēre, to cast back; see retort1.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
retortion
(rɪˈtɔːʃən) n1. the act of retorting
2. (Government, Politics & Diplomacy) a variant spelling of
retorsion Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014