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The Collaborative International Dictionary of English v.0.48 (gcide)

pager \pag"er\, n.
A small electronic communication device which signals when a
telephone call has been received at a base station. Each such
device receives radio signals from the base station
specifically coded for the individual to whom it is
registered; the signal given by the device to the registered
user may be a beeping sound, indicating that the user should
call the base station to receive a message; or it may display
a telephone number to which the user may call directly to
return the incoming call, or may display a short message.
Such devices are small enough to carry in the pocket or
pocketbook, or to clip onto a belt or other part of the
clothing. Also called {beeper}.
[PJC]