Definition of "Inca" :

noun: the small group of Quechua living in the Cuzco Valley in Peru who established hegemony over their neighbors in order to create an empire that lasted from about 1100 until the Spanish conquest in the early 1530s

noun: a member of the Quechuan people living in the Cuzco valley in Peru

noun: a ruler of the Incas (or a member of his family)