Kil·i·man·ja·ro (k?l??-m?n-jär??), Mount The highest mountain in Africa, in northeast Tanzania near the Kenya border, consisting of three volcanoes rising from a broad base. The highest peak, 5,895 m (19,341 ft) high, was first climbed in 1889.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.