tertiō adv.
tertius, for the third time : Non hercle veniam tertio, T.: pecuniam dare: consules creati, L.— In the third place, thirdly : haec spectans . . . simul, ut . . . tertio, ut, etc., Cs.
tertĭō, adv., v. tertius fin. A. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.