• (British, America) IPA: /nʌl/

null (plural nulls)

  1. A non-existent or empty value or set of values.
  2. Zero quantity of expressions; nothing.
    • 1605, Francis Bacon, “The Second Booke”, in The Tvvoo Bookes of Francis Bacon. Of the Proficience and Aduancement of Learning, Diuine and Humane, London: Printed [by Thomas Purfoot and Thomas Creede] for Henrie Tomes, […], OCLC 932932554 ↗, folio 61, recto ↗:
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  3. Something that has no force or meaning.
  4. (computing) the ASCII or Unicode character (), represented by a zero value, that indicates no character and is sometimes used as a string terminator.
  5. (computing) the attribute of an entity that has no valid value.
    Since no date of birth was entered for the patient, his age is null.
  6. One of the beads in nulled work.
  7. (statistics) null hypothesis
  • Russian: (zero) нуль


  1. Having no validity; "null and void"
  2. Insignificant.
    • 1924, Marcel Proust, Within a Budding Grove:
      In proportion as we descend the social scale our snobbishness fastens on to mere nothings which are perhaps no more null than the distinctions observed by the aristocracy, but, being more obscure, more peculiar to the individual, take us more by surprise.
  3. Absent or non-existent.
  4. (mathematics) Of the null set.
  5. (mathematics) Of or comprising a value of precisely zero.
  6. (genetics, of a mutation) Causing a complete loss of gene function, amorphic.
  • antinull
  • non-null

null (nulls, present participle nulling; past and past participle nulled)

  1. (transitive, archaic) To nullify; to annul.
  2. To form nulls, or into nulls, as in a lathe.
  3. (computing, slang, transitive) To crack; to remove restrictions or limitations in (software).
Related terms
Proper noun
  1. Surname

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