IPA: /ˈæktɪvɪzəm/
KK: /ˈæktɪˌvɪzəm/
The act of taking strong action to support or oppose a cause, often through protests or other direct methods.
Her activism for climate change has inspired many to join the movement.
Activism is formed from "act" (from Latin "agere", meaning to do or perform) and "-ism" (a suffix used to denote a practice or philosophy). The word refers to the practice of taking action to promote or bring about social or political change.
Think of 'acting' ('act') to create change, and '-ism' signifies a practice or belief. This helps you remember that activism is about actively doing something for a cause.