[nuhl] 
| 1. | without value, effect, consequence, or significance. |
| 2. | being or amounting to nothing; nil; lacking; nonexistent. |
| 3. | Mathematics. (of a set)
|
| 4. | being or amounting to zero. |
| 5. | Electronics. a point of minimum signal reception, as on a radio direction finder or other electronic meter. |
| 6. | to cancel; make null. |
| 7. | null and void, without legal force or effect; not valid: This contract is null and void. |
| null (nŭl) Pronunciation Key
Of or relating to a set having no members or to zero magnitude. |
null and void
Canceled, invalid, as in The lease is now null and void. This phrase is actually redundant, since null means "void," that is, "ineffective." It was first recorded in 1669.