That has been declared null / (computing) Whose value has been set to null

simple past tense and past participle of nullify

The act or process by which something is nullified.

present participle of nullify

plural of nullifier

One who, or that which, nullifies.

Third-person singular simple present indicative form of nullify

(transitive, law) To make legally invalid. / To prevent from happening. / To make of no use or value; to cancel out.

Able, or allowed to be nullified.

plural of nullifying