n.
Pronunciation: ' ak-ti- ˌ vi-z ə m
Function: noun
Date: 1915
: a doctrine or practice that emphasizes direct vigorous action especially in support of or opposition to one side of a controversial issue
– ac · tiv · ist \ -vist \ noun or adjective
– ac · tiv · is · tic \ ˌ ak-ti- ' vis-tik \ adjective