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>
First Known Use of think tank
THINK TANK Defined for English Language Learners
Definition of think tank for English Language Learners
: an organization that consists of a group of people who think of new ideas on a particular subject or who give advice about what should be done
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