An austere form of Islam dominant in Saudi Arabia and Qatar that follows a strict, literal interpretation of the Quran. Most people in the West knew nothing of Wahhabism until after the 9/11 attacks, which were organized by the terrorist Osama bin Laden, a Wahhabi. Wahhabism has spread rapidly since the 1970s, when the oil-rich Saudi royal family began contributing money to it. It is considered an extremist form of Sunni Islam that strictly enforces rules and criticizes those who follow other traditions of Islam. Use Wahhabi for a follower of Wahhabism.