the act or process of communicating; fact of being communicated.
the imparting or interchange of thoughts, opinions, or information by speech, writing, or signs.
something imparted, interchanged, or transmitted.
a document or message imparting news, views, information, etc.
passage, or an opportunity or means of passage, between places.
means of sending messages, orders, etc., including telephone, telegraph, radio, and television.
routes and transportation for moving troops and supplies from a base to an area of operations.
activity by one organism that changes or has the potential to change the behavior of other organisms.
transfer of information from one cell or molecule to another, as by chemical or electrical signals.

1375–1425; Middle English communicacioun < Middle French < Latin commūnicātiōn- (stem of commūnicātiō), equivalent to commūnicāt(us) (see communicate) + -iōn- -ion

communicational, adjective
noncommunication, noun
overcommunication, noun
precommunication, noun
self-communication, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
communication (kəˌmjuːnɪˈkeɪʃən)
1.  the act or an instance of communicating; the imparting or exchange of information, ideas, or feelings
2.  something communicated, such as a message, letter, or telephone call
3.  a.  (usually plural; sometimes functioning as singular) the study of ways in which human beings communicate, including speech, gesture, telecommunication systems, publishing and broadcasting media, etc
 b.  (as modifier): communication theory
4.  a connecting route, passage, or link
5.  (plural) military the system of routes and facilities by which forces, supplies, etc, are moved up to or within an area of operations

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

late 14c., from O.Fr. communicacion, from L. communicationem (nom. communicatio), from communicare "to share, divide out; impart, inform; join, unite, participate in," lit. "to make common," from communis (see common).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

communication com·mu·ni·ca·tion (kə-myōō'nĭ-kā'shən)

  1. The exchange of thoughts, messages, or information, as by speech, signals, writing, or behavior.

  2. An opening or a connecting passage between two structures.

  3. A joining or connecting of solid fibrous structures, such as tendons and nerves.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Unknown to those around him, he was also working on the theory behind
  information and communications.
Communications and information-gathering capabilities are either rudimentary or
We finally are building communications systems that approach the limits defined
  in that paper.
During emergencies, the importance of our country's communications systems
  becomes clear.
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