Definition of first world
: the highly developed industrialized nations often considered the westernized countries of the world
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“First world.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/first%20world. Accessed 25 Feb. 2021.
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Time Traveler for first world
The first known use of first world was in 1967
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