null

adjective

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

adjective

1. without legal force; invalid; (esp in the phrase null and void)
2. without value or consequence; useless
3. lacking distinction; characterlessa 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

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).

1. Of or relating to a set having no members or to zero magnitude.