Taqiyya: “To fear.” Based primarily on Koran 3:28 and 16:106, taqiyya is an Islamic doctrine allowing Muslims to dissemble their true beliefs when fearing persecution. Based on certain hadiths, some ulema expand the meaning of taqiyya to also permit general lying in order to advance any cause beneficial to Islam.
Raymond Ibrahim. The Al Qaeda Reader. New York: Broadway Books, 2007, p. xxi.