What is meaning of Sultanate Empire??
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Sultan is a position with several historical meanings. Originally, it was an Arabic abstract noun meaning "strength", "authority", "rulership", derived from the verbal noun sulṭah, meaning "authority" or "power" which retained that meaning to the present). Later, it came to be used as the title of certain rulers who claimed almost full sovereignty in practical terms (i.e., the lack of dependence on any higher ruler), albeit without claiming the overall caliphate, or to refer to a powerful governor of a province within the caliphate. The adjective form of the word is "sultanic",and the dynasty and lands ruled by a sultan are referred to as a sultanate...
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The Delhi Sultanate was an Islamic Empire based on Delhi that stretched over large parts of the Indian subcontinent for 320 years. Five dynasties ruled over the Delhi Sultanate sequentially: Mamluk/Slave dynasty, Khilji dynasty, Tughluq dynasty, Sayyid dynasty and Lodi dynasty.