Meaning of “altruism” in the English Dictionary

"altruism" in American English

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altruismnoun [ U ]

us /ˈæl·truˌɪz·əm/

the attitude of caring about others and doing acts that help them although you do not get anything by doing those acts:

Nobody believes those people are donating money to the president’s party purely out of altruism.
altruistic
adjective us /ˌæl·truˈɪs·tɪk/

altruistic motives

(Definition of “altruism” from the Cambridge Academic Content Dictionary © Cambridge University Press)