Dictionary![]() ![]() Ma'•mun, al-Pronunciation: (al'mä-mOOn', -ma-), [key] (abu-al-'Abbās 'Abdullāh) a.d.786–833, caliph of Baghdad 813–833 (son of Harun al-Rashid). Also,al-Mamoun. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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