group·ism | \ˈgrüˌpizəm\
plural -s

Definition of groupism 

: the tendency to think and act as members of a group : the tendency to conform to the cultural pattern of a group at the expense of individualism and cultural diversity groupism … rests not on obvious group emergencies but on the vague disquietude of lonely individuals— David Riesman

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First Known Use of groupism

1851, in the meaning defined above

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The first known use of groupism was in 1851

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a state of commotion or excitement

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