Webster's English Dictionary

retaliate

re.tal.i.ate \ri-'tal-e--.a-t\ \ri-.tal-e--'a--sh*n, .re--\ 
   \ri-'tal-e--.a-t-iv\ \-'tal-y*-.to-r-e-, -'tal-e--*-, -.to.r-\ vb [LL 
   retaliatus, pp. of retaliare, fr. re- + talio legal] retaliation : to repay 
   (as an injury) in kind  : to return like for like; esp : to get revenge  - 
   re.tal.i.a.tion n