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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 of null
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. 2015.
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Examples from the web for null
British Dictionary definitions for null

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
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 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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null in Technology

programming
A special value used in several languages to represent the thing referred to by an uninitialised pointer. database
A special value that may be stored in some database columns to represent an unknown, missing, not applicable, or undefined value. Nulls are treated completely differently from ordinary values when evaluating SQL expressions and there are several SQL constructs for dealing with nulls.
(2003-06-17)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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