1. Having no legal force; invalid: render a contract null and void.
2. Of no consequence, effect, or value; insignificant.
3. Amounting to nothing; absent or nonexistent: a null result.
4. Mathematics. Of or relating to a set having no members or to zero magnitude.
tr.v., nulled, null�ing, nulls.
To make null.
n.
1. Zero; nothing.
2. An instrument reading of zero.