Definition of "Algonquian" :

noun: family of North American Indian languages spoken from Labrador to South Carolina and west to the Great Plains

noun: a member of any of the North American Indian groups speaking an Algonquian language and originally living in the subarctic regions of eastern Canada; many Algonquian tribes migrated south into the woodlands from the Mississippi River to the Atlantic coast

adjective: of or relating to an Algonquian tribe or its people or language