[ ak-tuh-vist ]
/ ˈæk tə vɪst /
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.
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Origin of activist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
"one who advocates a doctrine of direct action," 1915; from active + -ist. Originally in reference to political forces in Sweden advocating abandonment of neutrality in World War I and active support for the Central Powers.
Online Etymology Dictionary, © 2010 Douglas Harper