Partisan

1. noun

   a pike with a long tapering double-edged blade with lateral projections; 16th and 17th centuries

   Similar: partizan

2. noun

   an ardent and enthusiastic supporter of some person or activity

   Similar: enthusiast, partizan

3. noun

   a fervent and even militant proponent of something

   Similar: zealot, drumbeater

4. adjective

   devoted to a cause or party

   Similar: partizan