Synonyms

null and void

[nuhl] Origin

null

[nuhl]
adjective
1.
without value, effect, consequence, or significance.
2.
being or amounting to nothing; nil; lacking; nonexistent.
3.
Mathematics. (of a set)
b.
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.

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Null and void is always a great word to know.
So is ort. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a scrap or morsel of food left at a meal.
verb (used with object)
6.
to cancel; make null.
7.
null and void, without legal force or effect; not valid: This contract is null and void.

Origin:
1555–65; < Latin nūllus, equivalent to n(e) not + ūllus any
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Etymonline
Word Origin & History

null
"void of legal force," 1563, from M.Fr. nul, from L. nullus "not any, none," from ne- "not, no" (see un-) + illus "any," dim. of unus "one."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
null   (nŭl)  Pronunciation Key 
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.
Cite This Source
American Heritage
Idioms & Phrases

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® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
Cite This Source
Dictionary.com, LLC. Copyright © 2012. All rights reserved.
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