Roman Catholicism; papalism.
Mid 19th century; earliest use found in Thomas Carlyle (1795–1881), author, biographer, and historian. From pope + -ism.
1Usually with capital initial. = "pop art"; the pop art movement; the attitudes, qualities, impact, etc., associated with pop art.
2The qualities, ideals, etc., of pop music.
1980s. From pop + ism.