ˈjünyəˌnizəm noun
( -s )
: the principle or policy of forming or adhering to a union : an advocacy or movement in favor of union: as
a. usually capitalized : adherence to the policy of a firm federal union between the states of the United States especially during the Civil War period
b. : the principles, theory, or system of combination of workers in the same occupation, trade, or industry
horizontal unionism
also : the labor union movement
the advance of unionism
c. : advocacy of the principles of the British Unionists