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null

[nuhl] /nʌl/
adjective
1.
without value, effect, consequence, or significance.
2.
being or amounting to nothing; nil; lacking; nonexistent.
3.
Mathematics.
  1. empty.
  2. of measure zero.
4.
being or amounting to zero.
noun
5.
Electronics. a point of minimum signal reception, as on a radio direction finder or other electronic meter.
verb (used with object)
6.
to cancel; make null.
Idioms
7.
null and void, without legal force or effect; not valid:
This contract is null and void.
Origin
1555-1565
1555-65; < Latin nūllus, equivalent to n(e) not + ūllus any
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for null and void
  • Bankruptcy would have made the contracts null and void, at best in line with all the unsecured creditors.
  • Tax authorities are increasingly able to declare null and void any transaction whose sole purpose is the avoidance of tax.
  • Contracts signed by other county personnel are null and void and do not obligate the county for payment of goods and/or services.
  • Tax receipts are null and void if payment is made with a check that fails to clear the bank.
British Dictionary definitions for null and void

null

/nʌl/
adjective
1.
without legal force; invalid; (esp in the phrase null and void)
2.
without value or consequence; useless
3.
lacking distinction; characterless a null expression
4.
nonexistent; amounting to nothing
5.
(maths)
  1. quantitatively zero
  2. relating to zero
  3. (of a set) having no members
  4. (of a sequence) having zero as a limit
6.
(physics) involving measurement in which an instrument has a zero reading, as with a Wheatstone bridge
Word Origin
C16: from Latin nullus none, from ne not + ullus any
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for null and void

null

adj.

"void of legal force," 1560s, from Middle French nul, from Latin nullus "not any, none," from ne- "not, no" (see un-) + illus "any," diminutive of unus "one" (see one).

Online Etymology Dictionary, © 2010 Douglas Harper
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null and void in Science
null
  (nŭl)   
Of or relating to a set having no members or to zero magnitude.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Idioms and Phrases with null and void
Canceled, invalid, as in The lease is now null and void. This phrase is actually redundant, since null means “void,” that is, “ineffective.” It was first recorded in 1669.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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