third world

Short definition from Wiktionary

Proper noun

1. 1
   Alternative letter-case form of Third World.
2. 2
   Those countries not aligned with the west or the east during the Cold War.
3. 3
   developing countries, especially that of Africa, Asia and Latin America
4. 4
   Any developing country, or a country lacking the perceived internationally respected ideal standards of a society (e.g. sufficient rule of law and internationally respected level of prosperity).
5. 5
   People of marginalized or exploited races, collectively.

Adjective

1. 1
   Of or from the Third World.
2. 2
   Alternative spelling of third-world.