noun
Refers to the doctrine or principle of taking proactive, direct action to achieve social or political change. Often used in ideological or philosophical contexts.
彼の政治思想は積極行動主義に基づいている。
His political thought is based on activism.
Compound of 積極 (positive, proactive), 行動 (action), and 主義 (principle, -ism). The term is a direct calque of English 'activism'.