Meaning of “think tank” in the English Dictionary

"think tank" in American English

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think tanknoun [ C ]

us /ˈθɪŋk ˌtæŋk/

(Definition of “think tank” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"think tank" in Business English

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think tanknoun [ C ]

uk us

a group of experts who are brought together to develop ideas and give advice on a particular subject:

corporate/economic/political think tank Investor confidence in Japan dropped to its lowest level in 16 months, according to a leading economic think tank.
think-tanker
noun [ C ] also think tanker

The Conference brings politicians, businessmen, and think-tankers together every year for debate on the economy.

(Definition of “think tank” from the Cambridge Business English Dictionary © Cambridge University Press)