n.
Function: noun
Date: 1846
1 a : one that is progressive b : one believing in moderate political change and especially social improvement by governmental action
2 capitalized : a member of any of various U.S. political parties: as a : a member of a predominantly agrarian minor party that around 1912 split off from the Republicans specifically : BULL MOOSE b : a follower of Robert M. La Follette in the presidential campaign of 1924 c : a follower of Henry A. Wallace in the presidential campaign of 1948