____ and void

adjective

1. Having no legal or binding force invalid

   "a null contract"

2. Amounting to nothing nil

   "the null uselessness of the wireless transmitter that lacks a receiving station"

3. Having no value insignificant

   "… news as null as nothing …"

4. Having no elements see element

   "null set"

5. Having zero as a limit

   "null sequence"

6. Having all elements equal to zero
7. Indicating usually by a zero reading on a scale when a given quantity (such as current or voltage) is zero or when two quantities are equal
8. Being or relating to a method of measurement in which an unknown quantity (as of electric current) is compared with a known quantity of the same kind and found equal by a null detector
9. Of, being, or relating to zero

   "The meter gave a null reading."

10. Zero

noun

1. Zero
2. A condition of a radio receiver when minimum or zero signal is received
3. A minimum or zero value of an electric current or of a radio signal

verb

1. To make null

adjective

1. Having no force, binding power, or validity

noun

1. A statistical hypothesis to be tested and accepted or rejected in favor of an alternative

noun

1. A subspace of a vector space consisting of vectors that under a given linear transformation are mapped onto zero

noun

1. The number of elements in the set of all integers which is the smallest transfinite cardinal number