The term sultana is the feminine form of the word sultan (Arabic: سلطان‎), an Arabic abstract noun meaning "strength", "authority", "rulership", derived from the verbal noun سلطة sulṭah, meaning "authority" or "power". Later, sultan came to be used as the title of certain rulers who claimed almost full sovereignty in practical terms, albeit without claiming the overall caliphate, or to refer to a powerful governor of a province within the caliphate.