Definition of "Caller" :

noun: a social or business visitor

noun: the person initiating a telephone call

"There were so many callers that he finally disconnected the telephone."

noun: the person who convenes a meeting

"Who is the caller of this meeting?."

noun: someone who proclaims or summons in a loud voice

"The callers were mothers summoning their children home for dinner."

noun: a person who announces the changes of steps during a dance

"You need a fiddler and a caller for country dancing."

noun: the bettor in a card game who matches the bet and calls for a show of hands

noun: an investor who buys a call option

adjective: fresh

"Caller fish."

adjective: providing coolness

"Caller' is a Scottish term as in a caller breeze'."