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.
Belonging to the period after a war, especially the U.S. Civil War: postbellum houses; postbellum governments.
Origin: Latin post, after + bellum, war.