Second World definition by American Heritage Dictionary
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.
also second worldnoun
During the Cold War, the Communist nations of the world.
- Secˈond-Worldˈ adjective