Other forms: callers
A caller is somebody who telephones or comes to visit. An anonymous caller, the caller hung up, callers welcome.
The telephone sense is much the commoner now. Caller display shows the number, and caller ID is the American term. The visiting sense is old-fashioned and belongs to a world where people called on each other without arranging it first. In bingo, the caller reads out the numbers. Note cold caller, meaning somebody selling by unsolicited phone call, which is regulated in Britain and widely ignored.
1nouncallerSomebody who telephones.
“The caller refused to give his name and hung up.”
2nounvisitSomebody who comes to visit.
“We had a caller this afternoon, an old friend of your father's.”
caller is a person who calls.
The word is call plus -er. Call comes from Old Norse kalla, to cry out, replacing the Old English word — one of the many everyday verbs English took from Norse.
Middle English
callar
English, today
caller
From Middle English callar, equivalent to call + er.
Etymology from Wiktionary, CC BY-SA