noun
A philosophical and ethical term referring to selfless concern for the well-being of others. Often used in academic or formal contexts.
利他主義は多くの宗教で重要な価値観とされている。
Altruism is considered an important value in many religions.
彼の行動は純粋な利他主義に基づいている
His actions are based on pure altruism.
Compound of 利他 (rita, 'benefiting others') and 主義 (shugi, '-ism'). 利他 is itself a Sino-Japanese word formed from 利 (ri, 'profit, benefit') and 他 (ta, 'other').