null

1 of 3

adjective

ˈnəl 

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 … ?

—Fred Majdalany

3

: having no value : insignificant

… news as null as nothing …

—Emily Dickinson

4

a

: having no elements (see element sense b(3))

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 (such 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

The meter gave a null reading.

7

: zero sense 1c

null

2 of 3

noun

1

: zero sense 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

null

3 of 3

verb

nulled; nulling; nulls

transitive verb

: to make null

Did you know?

Let’s be honest: null is kind of a nothing word. That’s not a judgment—it was literally borrowed into English from the Anglo-French word nul, meaning "not any." That word, in turn, traces to the Latin word nullus, from ne-, meaning "not," and ullus, meaning "any." Null often pops up in legal and scientific contexts; it was originally used in Scottish law and still carries the meaning "having no legal or binding force," especially in the phrase "null and void." In mathematics, it is sometimes used to mean "containing nothing"; for example, the set of all whole numbers that are divisible by zero is the "null set" (that is, there are no numbers that fit that description). Null is occasionally seen in non-technical contexts with the meaning "lacking meaning or value," as in "if no one reads it, the book's content is null."

Synonyms of null

Adjective

• void
• invalid

Verb

• abolish
• repeal
• cancel
• void
• avoid
• invalidate

Examples of null in a Sentence

Adjective

the contract was null because one party forgot to sign it

that information is as null as no information at all

Verb

asked the state court to null the election results because of widespread voting irregularities

Recent Examples on the Web

Adjective

For one, null results—in this case, findings that are not unusual or revelatory—are still useful. — Jackie Flynn Mogensen, Scientific American, 4 June 2026

However, in the face of an increasing number of null results, most notably in studies published in late 2025, most physicists now agree that this sterile neutrino doesn’t exist. — Quanta Magazine, 8 Apr. 2026

Noun

But the suspension confirmed so close to the primary election rendered 45,000 early voting ballots in the state null. — Sydney Topf, The Washington Examiner, 14 May 2026

Research found that systems were less likely to accurately classify the faces of women with darker complexions and that certain makeup patterns could render the technology null. — Hannah Fry, Los Angeles Times, 28 Apr. 2026

Verb

Ricart understood the changing dynamics in college football and was careful to include a contingency that would null the truck’s lease should Ewers transfer. — Jessica Rodriguez, Journal Sentinel, 8 Oct. 2022

Word History

Etymology

Adjective, Noun, and Verb

Anglo-French nul, literally, not any, from Latin nullus, from ne- not + ullus any; akin to Latin unus one — more at no, one

First Known Use

Adjective

1542, in the meaning defined at sense 1

Noun

1605, in the meaning defined at sense 1

Verb

1556, in the meaning defined above

Phrases Containing null

• aleph-null
• null and void
• null hypothesis
• null-space

Rhymes for null

• cull
• dull
• gul
• gull
• lull
• scull
• skull
• stull
• trull
• tulle
• seagull

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Kids Definition

null

adjective

ˈnəl

1

: having no legal or binding force : invalid

2

: having no value : insignificant

3

: having no elements

the null set

Legal Definition

null

adjective

ˈnəl 

: having no legal or binding force : void

a null contract

Etymology

Adjective

Anglo-French nul, literally, not any, from Latin nullus, from ne- not + ullus any