protester

Meanings

1. 1
   noun

   One who protests, either alone or in a public display of group feeling.

   The protesters thronged Trafalgar Square and sang anti-war songs.

2. 2
   noun

   One who protests a bill of exchange, or note.

   The protester must also draw up an affidavit containing the literal reproduction of the bill with its acceptance, endorsements, guarantee by endorsement ("aval"), and anything else contained in the note […]

3. 3
   noun

   someone who participates in a public display of group feeling

4. 4
   noun

   a person who dissents from some established policy

Etymology

From protest + -er.