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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.