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Verb: annul (annulled,annulling)  u'núl
  1. Declare invalid
    "The contract was annulled";
    - invalidate, quash, void, avoid, nullify
     
  2. Cancel officially
    "He annulled the ban on smoking";
    - revoke, lift, countermand, reverse, repeal, overturn, rescind, vacate

Derived forms: annuls, annulling, annulled

Type of: cancel, strike down

Encyclopedia: Annul