/ ˈkɔːkəs; NAmE / noun ( especially NAmE )
1.
a meeting of the members or leaders of a political party to choose candidates or to decide policy; the members or leaders of a political party as a group
2.
a group of people with similar interests, often within a larger organization or political party :
the Congressional Black Caucus
For more information see the Cultural Guide
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WORD ORIGIN
mid 18th cent. (originally US): perhaps from Algonquian cau'-cau'-as'u adviser.