An example of to retaliate is for a person to punch someone who has hit him.
intransitive verb-·at·ed, -·at·ing
Origin of retaliatefrom Late Latin retaliatus, past participle of retaliare, to require, retaliate from Classical Latin re-, back + talio, punishment in kind (see talion), akin to Welsh t?l, compensation
verbre·tal·i·at·ed, re·tal·i·at·ing, re·tal·i·ates
Origin of retaliateLate Latin retāliāre retāliāt-Latin re- re- Latin tāliō punishment in kind ; see telə- in Indo-European roots.
- re·tal′i·a′tive re·tal′i·a·to′ry
(third-person singular simple present retaliates, present participle retaliating, simple past and past participle retaliated)