1. Declare invalid
   "The contract was annulled"
   - invalidate, quash, void, avoid, nullify 
2. Cancel officially
   - revoke, lift, countermand, reverse, repeal, overturn, rescind, vacate

Derived forms: annuls, annulling, annulled

See also: annulment

Type of: cancel, strike down

Encyclopedia: Annul

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