Null

[nuhl] /nʌl/

adjective
1.
without value, effect, consequence, or significance.
2.
being or amounting to nothing; nil; lacking; nonexistent.
3.
Mathematics.

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.
/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)

6.
(physics) involving measurement in which an instrument has a zero reading, as with a Wheatstone bridge
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).
null
(nŭl)
Of or relating to a set having no members or to zero magnitude.

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)