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• Third World
  Third World

  noun

  the underdeveloped nations of the world, especially those with widespread poverty.
• third world
  third world

  Underdeveloped or developing countries, as in The conditions in our poorest rural areas resemble those in the third world. This expression originated in the mid-1900s, at first denoting those countries in Asia and Africa that were not aligned with either the Communist bloc nations or the non-Communist Western nations. Because they were for the most part poor and underdeveloped, the term was transferred to all countries with those characteristics, and later still to poorer groups within a larger prevailing culture.

Third World

American  

noun

(sometimes lowercase)

1. the underdeveloped nations of the world, especially those with widespread poverty.

2. the group of developing nations, especially of Asia and Africa, that do not align themselves with the policies of either the U.S. or the former Soviet Union.

3. the minority groups within a nation or predominant culture.

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Third World British  

noun

1. Also called: developing world.  the less economically advanced countries of Africa, Asia, and Latin America collectively, esp when viewed as underdeveloped and as neutral in the East-West alignment

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Third World Cultural  

1. The nonaligned nations — which are often developing nations — of Africa, Asia, and Latin America. They are in a “third” group of nations because they were allied neither with the United States nor with the former Soviet Union.

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third world Idioms  

1. Underdeveloped or developing countries, as in The conditions in our poorest rural areas resemble those in the third world. This expression originated in the mid-1900s, at first denoting those countries in Asia and Africa that were not aligned with either the Communist bloc nations or the non-Communist Western nations. Because they were for the most part poor and underdeveloped, the term was transferred to all countries with those characteristics, and later still to poorer groups within a larger prevailing culture.

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Compare meaning

How does third-world compare to similar and commonly confused words? Explore the most common comparisons:

• First World vs. Third World

Example Sentences

See Examples For:

Third World third world

A contender to lead the UN called Wednesday for artificial intelligence to be regulated like nuclear weapons, warning that a Third World War would be fought with the emerging technology.

From Barron's ● Sep. 16, 2026

Ehrlich urged wealthy nations to cut off food assistance to the Third World.

From The Wall Street Journal ● Mar. 17, 2026

In fact, on a midnight shift in Cheyenne Mountain, I even read Tom Clancy’s “Red Storm Rising,” which envisioned the Cold War gone hot, a Third World War gone nuclear.

From Salon ● Dec. 7, 2025

"I'm not going to start the Third World War for you," he is reported to have told General Wesley Clark.

From BBC ● Oct. 15, 2024

“I’m unable to travel back to the Third World in my current condition. I barely made the journey to this holy hogan, and I have used almost all the medicine in my pouch.”

From "Healer of the Water Monster" by Brian Young

We have traveled from the illusion that humanity had left global wars behind forever to the stark prospect of a third world war that could span continents and have devastating global consequences.

From The Wall Street Journal ● Aug. 23, 2026

In November 2024, Koguan said he was “no longer all-in-Tesla” and began acquiring Treasury bills, citing his fear of a “1929 type stock market crash” and a potential third world war.

From MarketWatch ● Mar. 4, 2026

Two-time defending champion Kim, 25, has dominated women's halfpipe since the 2022 Beijing Games, winning X Games gold in 2024 and 2025 and claiming her third world championship title last year.

From Barron's ● Feb. 11, 2026

Duplantis surpassed a record-extending 100 career clearances over six metres in winning his third world indoor title in March.

From BBC ● Sep. 15, 2025

The central plateau was his roots as an epidemiologist and a clinician, and a model of how a committed staff on a limited budget could raise the standard of health in the third world.

From "Mountains Beyond Mountains" by Tracy Kidder and Michael French