re·dun·dan·cy

[ri-duhn-duhn-see]
noun, plural re·dun·dan·cies.
1.
the state of being redundant.
2.
superfluous repetition or overlapping, especially of words.
3.
a redundant thing, part, or amount; superfluity.
4.
the provision of additional or duplicate systems, equipment, etc., that function in case an operating part or system fails, as in a spacecraft.
5.
Linguistics.
a.
the inclusion of more information than is necessary for communication, as in those cars, where both words are marked for plurality.
b.
the additional, predictable information so included.
c.
the degree of predictability thereby created.
6.
Chiefly British.
a.
the condition or fact of being unemployed; unemployment.
b.
a layoff.
Also, re·dun·dance.

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

Can be confused: redundancy, tautology.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Redundancy is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a scrap or morsel of food left at a meal.
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Collins
World English Dictionary
redundancy (rɪˈdʌndənsɪ) [Click for IPA pronunciation guide]
 
—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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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FOLDOC
Computing Dictionary

redundancy definition


1. The provision of multiple interchangeable components to perform a single function in order to provide resilience (to cope with failures and errors). Redundancy normally applies primarily to hardware. For example, a cluster may contain two or three computers doing the same job. They could all be active all the time thus giving extra performance through parallel processing and load balancing; one could be active and the others simply monitoring its activity so as to be ready to take over if it failed ("warm standby"); the "spares" could be kept turned off and only switched on when needed ("cold standby"). Another common form of hardware redundancy is disk mirroring.
2. data redundancy.
(1995-05-09)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Downturns certainly help focus managers' minds, especially when the spectre of
  redundancy haunts the office corridors.
Then there's the redundancy in the wire support in our system.
Each dish is a neat tableau, with little or no redundancy.
Because you feel comfortable that there's redundancy.
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