Etymology
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retaliation (n.)

"return of like for like, action of retaliating," 1580s, noun of action from Late Latin retaliare "pay back in kind," from re- "back" (see re-) + Latin talio "exaction of payment in kind," believed to be a derivative (on the notion of "compensation with the same") of talis "suchlike" from PIE *teh-li- "such" (source also of Welsh talu "to pay," Greek tēlikos "of such an age," Lithuanian tōlei, Old Church Slavonic toli "to such a degree"); see -th (1).

Originally used repayments of good or evil, now usually of injuries, insult, etc. Meaning "an instance of retaliating" is from 1640s.

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Definitions of retaliation

retaliation (n.)
action taken in return for an injury or offense;
Synonyms: revenge
From wordnet.princeton.edu