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nor 's

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NOR

[nawr]
–noun
a Boolean operator that returns a positive result when both operands are negative.

Origin:
1955–60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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NOR   (nôr)   
n.  A logical operator that consists of a logical OR followed by a logical NOT and returns a true value only if both operands are false.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

nor 
c.1300, contraction of M.E. nauther (see neither). Influenced in form by or.
Online Etymology Dictionary, © 2001 Douglas Harper
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