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English definition of “think tank”

think tank

noun [C]    
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 (also think tanker) noun [C]
(Definition of think tank noun from the Cambridge Business English Dictionary © Cambridge University Press)
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