/ ˈkwɔːrəm; NAmE / noun
[ sing. ] the smallest number of people who must be at a meeting before it can begin or decisions can be made
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WORD ORIGIN
late Middle English (referring to justices of the peace): used in commissions for committee members designated by the Latin quorum vos ... unum ( duos , etc.) esse volumus of whom we wish that you ... be one (two, etc.).