Lewis Short
lītĭgātor (noun M) : id.
* One engaged in a dispute, a disputant.
* In gen., Plin. praef. § 32: litigatores furiosi,Lact. 3, 8 init. (al. litigationes, v. litigatio).
* In partic., a party in a lawsuit, a litigant: litigator rusticus illitteratusque de sua causa melius, quam orator, qui nescit, quid in lite sit, dicet,Quint. 2, 21, 16: ne omnia testimonia expetat a litigatore,id. 10, 1, 34; Tac. A. 13, 42; Plin. Pan. 80; Gai. Inst. 4, 42; 105 et saep.
Charlton T. Lewis, Charles Short, A Latin Dictionary