- an especially active, vigorous advocate of a cause, especially a political cause.
- of or relating to activism or activists: an activist organization for environmental concern.
- advocating or opposing a cause or issue vigorously, especially a political cause: Activist opponents of the president picketed the White House.
Origin of activist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Online Etymology Dictionary, © 2010 Douglas Harper