First World Definition
noun
The countries of the world that are well developed economically and industrially and that have a relatively high standard of living.
Webster's New World
The wealthiest and most highly-developed nations in the world.
American Heritage
During the Cold War, the industrialized capitalist nations of the world.
American Heritage
pronoun
Those countries aligned with the West during the Cold War, particularly in contrast to those aligned with the East (Second World).
Wiktionary
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