Longman Dictionary of Contemporary English - left-wing

~1 adj supporting the political aims of groups such as Socialists and Communists, such as the idea that money and property should be divided more fairly  (She's very left-wing. | a left-wing newspaper)  (- opposite right-wing) - left-winger n ~2 n the group of people, within a larger political group, whose ideas are more left-wing than those of other members of the group  (He's on the left wing of the Conservative Party. | The party has a small but powerful left wing.)