caller
n. countable B1 Intermediate US //ˈkɔɫɝ// UK //kˈɔːlɐ// call·er
n. the person who is making a phone call. You use this word to describe the person on the other end of the line.
n. the person who initiates a telephone conversation. In a technical computing context, it refers to the function or piece of code that executes another function.
The caller hung up before I could answer.
The customer service agent asked the caller to stay on the line while they checked the account details.
If the caller remains anonymous, the system automatically routes the request to a security screening queue before connecting to a live representative.
From Middle English callar, equivalent to call + -er.
Usage
Commonly used in the phrase 'anonymous caller' or 'first-time caller'.