/ˈæktɪvɪst/

ac·tiv·ist

BrE /ˈæktɪvɪst/

NAmE /ˈæktɪvɪst/

a person who works to achieve political or social change, especially as a member of an organization with particular aims

gay activists

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ac·tiv·ism

BrE /ˈæktɪvɪzəm/

NAmE /ˈæktɪvɪzəm/

[U]