虛空
Từ Điển Thuật Ngữ Phật Học Hán Ngữ
śūnya; empty, void, space; ākāśa, in the sense of space, or the ether; gagana, the sky, atmosphere, heaven; kha, space, sky, ether, 虛 is defined as that which is without shape or substantiality, 空 as that which has no resistance. The immaterial universe behind all phenomena.