1.in the United States, one of three related political parties that favoured social reform and were active in the presidential elections of 1912, 1924, and 1948
2.a Canadian national political party formed in 1920 from members of farmers' movements and dissident Liberals that was dissolved in 1942
3.a South African national political party that was formed in 1959 by members of the United Party and merged again with part of the United Party in 1977 to form the Progressive Federal Party