Definition of Forum
Lat. A court of justice, or judicial tribunal; a place of jurisdiction; a place of litigation; an administrative body. Particular place where judicial or administrative remedy is pursued. See also Venue.
In Roman law, the market place, or public paved court, in the city of Rome, where such public business was transacted as the assemblies of the people and the judicial trial of causes and where also elections, markets, and the public exchange were held.
That's the definition of Forum in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.