caller

A social or business visitor.

A person who announces the changes of steps during a dance.

“you need a fiddler and a caller for country dancing”

The person initiating a telephone call.

“there were so many callers that he finally disconnected the telephone”

An investor who buys a call option.

Someone who proclaims or summons in a loud voice.

“the callers were mothers summoning their children home for dinner”

The bettor in a card game who matches the bet and calls for a show of hands.

The person who convenes a meeting.

“who is the caller of this meeting?”

Fresh.

“caller fish”

Providing coolness.

“`caller' is a Scottish term as in `a caller breeze'”