Source : Webster's Revised Unabridged Dictionary (1913)

Caller \Cal"ler\, a. [Scot.]
   1. Cool; refreshing; fresh; as, a caller day; the caller air.
      --Jamieson.

   2. Fresh; in good condition; as, caller berrings.

Caller \Call"er\, n.
   One who calls.

Source : WordNet®

caller
     n 1: a social or business visitor; "the room was a mess because
          he hadn't expected company" [syn: {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"
        [syn: {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" [syn:
        {caller-up}, {phoner}, {telephoner}]

caller
     adj 1: providing coolness; "a cooling breeze"; "`caller' is a
            Scottish term as in `a caller breeze'"
     2: fresh; "caller fish"