I. ˈnəl adjective
Etymology: Anglo-French nul, literally, not any, from Latin nullus, from ne- not + ullus any; akin to Latin unus one — more at no , one
Date: circa 1567
1. : having no legal or binding force : invalid
2. : amounting to nothing : nil
3. : having no value : insignificant
4.
a. : having no elements
null set
b. : having zero as a limit
null sequence
c. of a matrix : having all elements equal to zero
5.
a. : indicating usually by a zero reading on a scale when a given quantity (as current or voltage) is zero or when two quantities are equal — used of an instrument
b. : 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
6. : of, being, or relating to zero
7. : zero 1c
II. noun
Date: 1605
1. : zero 3a(1)
2.
a. : a condition of a radio receiver when minimum or zero signal is received
b. : a minimum or zero value of an electric current or of a radio signal
III. transitive verb
Date: 1643
: to make null