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Definitions of Alamut:
noun: A castle in Iran which functioned as the main stronghold of the Nizari Ismaili state, also known as the assassins.
noun: A region in the modern-day Qazvin province of Iran in which the castle is located.
noun: A period in the history of the Nizari Ismailism beginning from the capture of the castle in 1090 AD until its capitulation to the Mongols in 1256 AD.