Pronunciation: (nul),[key] —adj. 1. without value, effect, consequence, or significance.
2. being or amounting to nothing; nil; lacking; nonexistent.
3. Math.(of a set)
b. of measure zero.
4. being or amounting to zero.
5. null and void, without legal force or effect; not valid: This contract is null and void.
—n. Electronics.a point of minimum signal reception, as on a radio direction finder or other electronic meter.