activist

Meanings

1. 1
   noun

   One who is politically active in the role of a citizen; especially, one who campaigns for change.

   It has jailed environmental activists and is planning to limit the power of judicial oversight by handing a state-approved body a monopoly over bringing environmental lawsuits.

2. 2
   adj

   Behaving as an activist.

   Even in the area of free speech, Justice Harlan sometimes emerged as more activist than his brother

3. 3
   adj

   advocating or engaged in activism

4. 4
   noun

   a militant reformer

5. 5
   noun

   One who is conspicuously active in carrying out any occupational or professional functions.

Etymology

From active + -ist.