caller
UK: ˈkɔːlə | US: ˈkɔːlər
n. a person who makes a phone call or visits a place
n. (computing) a function or program that initiates a subroutine
n. (historical) a person who announces or summons others
The word "caller" originates from the Old English "callian" (to shout or summon), which evolved into Middle English "callen." The suffix "-er" denotes an agent noun, indicating someone or something that performs the action of the verb. Over time, "caller" expanded from its literal sense of "one who shouts" to include modern meanings like "phone caller" or "function caller" in computing.
The caller left a voicemail about the meeting.
In programming, the caller must handle the subroutine's return value.
The town crier acted as the official caller for announcements.
An unknown caller rang twice but didn’t leave a message.
The radio show invited a caller to share their opinion live on air.