Source : WordNet®

pager
     n : an electronic device that generates a series of beeps when
         the person carrying it is being paged [syn: {beeper}]

Source : Free On-Line Dictionary of Computing

pager
     
        1.  (Or "beeper", "bleeper" (UK?))
        A small wireless receiver that, when triggered (generally via
        phone), will beep or vibrate (un)pleasantly.  The wearer will
        have been trained to respond to this signal by looking at a
        small screen on the device for an unimportant message.
     
        In recent years, pagers have grown more complex, allowing for
        long {alphanumeric} messages to be received and scrolled
        though (as opposed to earlier models, which supported only
        short numeric messages); at the same time as pager functions
        are integrated into some {PDA}s.  If this trend continues, the
        distinction between {PDA}s and high-end {pagers} will
        disappear.
     
        {Short Message Service} allows a mobile phone to display a
        message, just like an alphanumeric pager.
     
        2.  A program for viewing a {text file} a screenful at a
        time via a text {terminal}, as opposed to scrolling through it
        in a {GUI} window, or {cat}ting it all at once to the
        terminal.
     
        The best known pagers are {more}, {less}, pg and list.com.
     
        (1997-09-11)