noun, plural redundancies.
the state of being redundant.
superfluous repetition or overlapping, especially of words.
a redundant thing, part, or amount; superfluity.
the provision of additional or duplicate systems, equipment, etc., that function in case an operating part or system fails, as in a spacecraft.
the inclusion of more information than is necessary for communication, as in those cars, where both words are marked for plurality.
the additional, predictable information so included.
the degree of predictability thereby created.
Chiefly British.
the condition or fact of being unemployed; unemployment.
a layoff.
Also, redundance.

1595–1605; < Latin redundantia an overflowing, excess, derivative of redundāns redundant; see -ancy

redundancy, tautology. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
redundancy (rɪˈdʌndənsɪ)
n , pl -cies
1.  a.  the state or condition of being redundant or superfluous, esp superfluous in one's job
 b.  (as modifier): a redundancy payment
2.  excessive proliferation or profusion, esp of superfluity
3.  duplication of components in electronic or mechanical equipment so that operations can continue following failure of a part
4.  repetition of information or inclusion of additional information to reduce errors in telecommunication transmissions and computer processing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Cultural Dictionary

redundancy definition

Unnecessary repetition in speech or writing. The expression freedom and liberty is redundant.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
But putting people's health information in databases and online is going to do
  more than simply reduce redundancies.
But the redundancies it created also had tremendous value when things went
XX minimizes the redundancies to deliver basically the same gearing, but in a
  simpler and lighter package.
In the meantime they cannot rule out making redundancies in both businesses.
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