noun
Refers to a person who actively engages in social or political action based on their beliefs. The term is a compound of 積極 (positive, proactive), 行動 (action), 主義 (principle, doctrine), and 者 (person).
彼は環境保護のための積極行動主義者として知られている。
He is known as an activist for environmental protection.
活動家 is a more common and general term for 'activist', while 積極行動主義者 emphasizes a proactive, principle-driven approach to activism.
Compound of 積極 (positive, proactive), 行動 (action), 主義 (principle, doctrine), and 者 (person). The term appears to be a modern coinage describing a person who adheres to proactive activism.