Kaa·ba, the /ˈkɑːbə/ BrE AmE
a building in the shape of a ↑ cube that is inside the al-Masjid al-Haram ↑ mosque in Makkah (Mecca), Saudi Arabia. It is the holiest place in Islam, and the direction which Muslims pray towards. During the Hajj, people walk together around the Kaaba as part of the religious ceremony.