a radical Sunni Muslim organization dedicated to the elimination of a Western presence in Arab countries and militantly opposed to Western foreign policy: founded by Osama bin Laden in 1988.
al-Qae·da or al-Qai·da (āl-kā'də, -kī'də, -kä'ē-də) n. An international organization of loosely affiliated cells that carry out attacks and bombings in the attempt to disrupt the economies and influence of Western nations and advance Islamic fundamentalism.
[Arabic al-qā'ida, the base : al-, the + qā'ida, foundation, base, feminine participle of qa'ada, to sit.]