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Found 4 definitions

  1.                 From The Collaborative International Dictionary of English v.0.48:
                    

    Null \Null\, v. t. [From null, a., or perh. abbrev. from annul.] To annul. [Obs.] --Milton. [1913 Webster]

  2.                 From The Collaborative International Dictionary of English v.0.48:
                    

    Null \Null\, n. [Etymol. uncertain.] One of the beads in nulled work. [1913 Webster]

  3.                 From The Collaborative International Dictionary of English v.0.48:
                    

    Null \Null\, a. [L. nullus not any, none; ne not + ullus any, a dim. of unus one; cf. F. nul. See No, and One, and cf. None.] 1. Of no legal or binding force or validity; of no efficacy; invalid; void; nugatory; useless. [1913 Webster]

    Faultily faultless, icily regular, splendidly null, Dead perfection; no more. --Tennyson. [1913 Webster]

    2. Having a value of zero; as, of null utility. [PJC]

    3. (Math.) Empty; having no members; as, the null set. [PJC]

    4. (Computers) Unassigned or meaningless; -- a special value given to variables, especially pointers or logical variables, indicating that it is meaningless and cannot be used in computation; as, an uninitialized pointer in "C" is given a null value. The actual value that is stored in memory to indicate the null condition may vary with the computer language used. [PJC]

  4.                 From The Collaborative International Dictionary of English v.0.48:
                    

    Null \Null\, n. 1. Something that has no force or meaning. [1913 Webster]

    2. That which has no value; a cipher; zero. --Bacon. [1913 Webster]

    Null method (Physics.), a zero method. See under Zero. [1913 Webster]