Annulment

Etymology
Recorded since the 15th century (sense destruction); from to annul (from annullen, from  annuller, from  annullare, from ad 'to' nullus 'not any, nothing' + verbal ending -are)+ -ment 'means to' (from  -mentum)

Noun

 * 1) An act or instance of annulling.
 * 2) A state of having been annulled.
 * 3) An invalidation of something, especially a legal contract
 * 4) A legal (notably judicial) declaration that a marriage is invalid; the procedure leading to it.
 * 5)  Total destruction.

Synonyms

 * abolition
 * nullification (cognate)
 * cancellation

Thesaurus
abjuration; abjurement; abolishment; abolition; abrogation; absolute contradiction; annihilation; broken home; broken marriage; cancel; canceling; cancellation; cassation; choking; choking off; contradiction; contrary assertion; contravention; controversion; counterbalancing; countering; countermand; counterorder; crossing; decree of nullity; defeasance; denial; deracination; disaffirmation; disallowance; disavowal; disclaimer; disclamation; disownment; disproof; dissolution of marriage; divorce; divorcement; elimination; eradication; extermination; extinction; extinguishment; extirpation; forswearing; frustration; gainsaying; grasswidowhood; impugnment; interlocutory decree; invalidation; liquidation; negation; neutralization; nullification; offsetting; purge; recall; recantation; refutation; renege; renunciation; repeal; repudiation; rescinding; rescindment; rescission; retractation; retraction; reversal; revocation; revoke; revokement; rooting out; separate maintenance; separation; setting aside; silencing; snuffing out; stifling; strangulation; suffocation; suppression; suspension; thwarting; undoing; uprooting; vacation; vacatur; vitiation; voidance; voiding; waiver; waiving; withdrawal; write-off