altruism altrose • altruist · · · Info · Definitions · Synonyms · Antonyms · Characters · · altruism · · Text Latin · · Script 8 · · Length Definitions · · · (noun) the quality of unselfish concern for the welfare of others. Synonyms: selflessness. · · Noun Definition 1 Synonyms · · · selflessness · · Synonym 1 Antonyms · · · egoism · · Antonym 0 egocentrism · · Antonym 1 self-interest · · Antonym 2 self-concern · · Antonym 3 self-centeredness · · Antonym 4 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075