nacimiento
/naθiˈmjento/ · B1 · noun · m
birth
👶 naci- from Latin nasci, to be born: kin to nascent, native, nativity
Nacer means to be born, and -miento turns a verb into a noun, so nacimiento is the act of being born. The same root covers a river's source and a nativity scene, which is the scene of a birth.