noun
A loanword from English, used in philosophical, psychological, or sociological contexts to refer to selfless concern for the well-being of others. Less common than the native term 利他主義 (りたしゅぎ).
オルトルイズムは、利他主義とも呼ばれる概念です。
Altruism is a concept also called 利他主義.
彼の行動は純粋なオルトルイズムに基づいている。
His actions are based on pure altruism.