systems engineering

PA system; public address system

(computing) filesystem

sworn elder brother / (gay slang) older male in a homosexual relationship

a small hawk / a male hawk / musket, male sparrowhawk

older paternal half brother

(honorific) older brother

(archaic, women's speech) an intimate form of address for a male by a female: "my brother"

elder brothers and sisters; elder sibling

(archaic) a noblewoman who is elder sister to another one in her family