IPA: /ˈsɛlf.ləs.nəs/
KK: /ˈsɛlfˌlɛs.nəs/
The quality of caring more about others than oneself and putting their needs before your own.
Her selflessness was evident when she volunteered to help the homeless every weekend.
Selflessness → It is formed from "self" (from Old English "seolf", meaning oneself) and "-lessness" (meaning without). The word "selflessness" means the state of being without self or ego, focusing on the needs of others instead.
Think of being 'without' ('-lessness') your own 'self' ('self') — that's what selflessness means.