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WordNet (r) 3.0 (2006) (WordNet)

caller
adj 1: providing coolness; "a cooling breeze"; "`caller' is a
Scottish term as in `a caller breeze'"
2: fresh; "caller fish"
n 1: a social or business visitor; "the room was a mess because
he hadn't expected company" [synonym: {caller}, {company}]
2: an investor who buys a call option
3: the bettor in a card game who matches the bet and calls for a
show of hands
4: a person who announces the changes of steps during a dance;
"you need a fiddler and a caller for country dancing" [synonym:
{caller}, {caller-out}]
5: someone who proclaims or summons in a loud voice; "the
callers were mothers summoning their children home for
dinner"
6: the person who convenes a meeting; "who is the caller of this
meeting?"
7: the person initiating a telephone call; "there were so many
callers that he finally disconnected the telephone" [synonym:
{caller}, {caller-up}, {phoner}, {telephoner}]