Retaliation
early 17th century: from Latin retaliat- ‘returned in kind’, from the verb retaliare, from re- ‘back’ + talis ‘such’.
wiktionary
From retaliate + -ion.
etymonline
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.
