1. countable noun If you have a brainstorm, you suddenly become unable to think clearly. [British] ⇒ I can have a brainstorm and be very extravagant. 2. countable noun If you have a brainstorm, you suddenly have a clever idea. [US] ⇒ 'Look,' she said, getting a brainstorm, 'Why don't you invite them here?'regional note: in BRIT, usually use brainwave 3. verb If a group of people brainstorm, they have a meeting in which they all put forward as many ideas and suggestions as they can think of. [V] ⇒ The women meet twice a month to brainstorm and set business goals for each other. [V n] ⇒ We can brainstorm a list of the most influential individuals in the company. brainstorming
uncountable noun ⇒ Hundreds of ideas had been tried and discarded during two years of brainstorming.
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