noun Informal.
an intercommunication system.
a microphone or receiver of an intercommunication system.

1935–40; by shortening Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intercom (ˈɪntəˌkɒm)
informal an internal telephone system for communicating within a building, an aircraft, etc
[C20: short for intercommunication]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1940, colloquial shortening of intercommunication, which is attested from 1911 in ref. to systems of linked telephones.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

INTERCOM definition

The assembly language for the G-15.
Versions: INTERCOM 101, INTERCOM 1000.
[Listed in CACM 2(5):16, May 1959].
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The fire safety desks also had an intercom system to speak to people inside the
It's time to run through another descent exercise, an instructor tells them
  over an intercom.
His station was announced over the intercom, and the train slowed with a lurch
  of brakes.
Access to any part, such as a remote intercom station, might provide access to
  all parts.
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