a person who communicates, especially one skilled at conveying information, ideas, or policy to the public.
a person in the business of communications, as television or magazine publishing.

1655–65; < Late Latin commūnicātor; see communicate, -tor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
communicate (kəˈmjuːnɪˌkeɪt)
vb (usually foll by to) (usually foll by with)
1.  to impart (knowledge) or exchange (thoughts, feelings, or ideas) by speech, writing, gestures, etc
2.  to allow (a feeling, emotion, etc) to be sensed (by), willingly or unwillingly; transmit (to): the dog communicated his fear to the other animals
3.  (intr) to have a sympathetic mutual understanding
4.  to make or have a connecting passage or route; connect
5.  (tr) to transmit (a disease); infect
6.  (intr) Christianity to receive or administer Communion
[C16: from Latin commūnicāre to share, from commūniscommon]

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

1660s, from L. communicator, agent noun from communicare (see communication).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He was not only a great scientist but also an amazing science communicator.
Taking inventory of her skill set, she realized she's a natural communicator
  who loves shopping and being helpful.
So my advice to someone who wanted to be a science communicator is, you write.
He's a great science communicator and advocate for science and reason.
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