ba ‧ sil ‧ i ‧ ca /bəˈsɪlɪkə, -ˈzɪl-/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Language: Latin ; Origin: Greek basilike , from basilikos 'royal' , from basileus 'king' ]
a church in the shape of a long room with a round end:
the basilica of St Peter’s in Rome