Definition of think tank
: an institute, corporation, or group organized to study a particular subject (such as a policy issue or a scientific problem) and provide information, ideas, and advice
an information technology think tank … was responsible for the armies of new political-action committees, lobbyists and rightward think tanks that poured into Washington to counter the consumer and environmental movements he helped to inspire.— Jonathan Rowe
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Merriam-Webster unabridged
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Time Traveler for think tank
The first known use of think tank was in 1958
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