basilica

basilica    Architecture.  1. in ancient Rome, a large oblong building used as a court of justice, usually lit by a clerestory and having double colonnades and a semicircular apse.in ancient Rome, a large oblong building used as a court of justice, usually lit by a clerestory and having double colonnades and a semicircular apse. 2. a similar building used as a Christian church.a similar building used as a Christian church.