plural brainstormings
Definition of brainstorming
: a group problem-solving technique that involves the spontaneous contribution of ideas from all members of the group
conducted several brainstorming sessions
also
: the mulling over of ideas by one or more individuals in an attempt to devise or find a solution to a problem
… he's already done some brainstorming about new marketing strategies. — George Lazarus
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Merriam-Webster unabridged
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Time Traveler for brainstorming
The first known use of brainstorming was in 1907
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