01 a. Of no legal or binding force or validity; of no efficacy; invalid; void; nugatory; useless.
-
1.
Of no legal or binding force or validity; of no efficacy; invalid; void; nugatory; useless.“Faultily faultless, icily regular, splendidly null, Dead perfection; no more.” — Tennyson.
-
2.
Having a value of zero; as, of null utility.
-
3.
Empty; having no members; as, the null set.(Math.)
-
4.
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.(Computers)