A person who believes in or advocates for opposing aggression and aggressive actions.
Formed from 'antiaggression' plus the suffix '-ist' (one who practices or believes in). This specialized term emerged in political discourse in the early 20th century.
The '-ist' suffix transforms an abstract idea into a person with beliefs—languages let us name not just what someone does, but who they fundamentally are, which is why calling someone an 'activist' means something different than just saying they 'do activities.'
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