The Collaborative International Dictionary
Mahdism \Mah"dism\, n. Belief in the coming of the Mahdi; fanatical devotion to the cause of the Mahdi or a pretender to that title. -- Mah"dist, n.
Mahdism has proved the most shameful and terrible
instrument of bloodshed and oppression which the modern
world has ever witnessed.
--E. N. Bennett.