Lewis & Short

fŏrensis, e, adj. [forum], of or belonging to the market or forum, public, forensic: oratio judicialis et forensis, i. e. delivered in the forum, Cic. Or. 51, 170; cf.: Thucydides hoc forense, concertatorium, judiciale non tractavit genus, id. Brut. 83, 287: genus (dicendi) remotum a judiciis forensique certamine, id. Or. 61, 208: rhetorica, id. Fin. 2, 6, 17: dictio, id. Brut. 78, 272; cf.: species, id. Planc. 12, 29: in omnibus publicis privatis, forensibus domesticis, tuis amicorum negotiis, id. Fam. 5, 8 fin.: res (opp. domesticae litterae), id. Or. 43 fin.: sententia (opp. domestica), id. Fin. 2, 24, 77: Marte forensi florere, i. e. eloquence, Ov. P. 4, 6, 29: vestitu forensi ad portam est egressus, i. e. in his out-of-door dress (opp. to housedress), Liv. 33, 47 fin.; cf.: ut vestitum, sic sententiam habeas aliam domesticam, aliam forensem, Cic. Fin. 2, 24, 77: tutores constituunturfeminis, propter forensium rerum ignorantiam, Ulp. Fragm. 11, 1.
Absol.: forensia, dress of state, Suet. Aug. 73; id. Calig. 17: a natura comparata est opera mulieris ad domesticam diligentiam, viri ad exercitationem forensem et extraneam, Col. 12 praef. § 4.
Subst.: rusticus, forensis, negotiator, miles, navigator, medicus, aliud atque aliud efficiunt, a public pleader, advocate, Quint. 5, 10, 27.
Plur., Vitr. 6, 5, 2.
With an odious access. notion: ex eo tempore in duas partes discessit civitas: aliud integer populus, fautor et cultor bonorum, aliud forensis factio tenebat, the market-place party or faction, i. e. worthless persons who hung about the market-places, Liv. 9, 46, 13; Quint. 12, 1, 25.