Fourth World: Meaning and Definition of

Fourth' World'

Pronunciation: [key]
  1. the world's most poverty-stricken nations, esp. in Africa and Asia, marked by very low GNP per capita and great dependence upon foreign economic aid. Cf. First World, Second World, Third World.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.