hy·phen·ism | \ˈhīfəˌnizəm\
plural -s

Definition of hyphenism 

: the quality or state of being a hyphenate : the conduct that marks or is ascribed to hyphenates hyphenism in the United States is almost extinct— E. A. Mowrer

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History and Etymology for hyphenism

hyphen entry 1 + -ism; from the use of hyphenated words (as German-American, Irish-American) to designate foreign-born citizens of the U.S.

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