The Collaborative International Dictionary of English v.0.48:
Forum \Fo"rum\, n.; pl. E. Forums, L. Fora. [L.; akin to
foris, foras, out of doors. See Foreign.]
1. A market place or public place in Rome, where causes were
judicially tried, and orations delivered to the people.
2. A tribunal; a court; an assembly empowered to hear and
He [Lord Camden] was . . . more eminent in the
senate than in the forum. --Brougham.