noun
1. : a minority group seeking to influence legislation in its own interest (as by lobbying or propaganda)
political scientists who tend to think that the pressure groups are the highest form of political organization of which Americans are capable — E.E.Schatt-Schneider
2. : a group using tactics resembling the tactics of political pressure groups to promote its interests or affect public opinion
pressure groups which insist that the high school maintain a winning football team — Paul Woodring