The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A region and former Muslim kingdom of western Africa occupying a vast plain in present-day northeast Nigeria. Founded in the 11th century, the kingdom reached the height of its power in the late 16th century. The region became part of Nigeria in 1902.