1. Refusal to acknowledge as one's own
   "His disowning of his son caused a family rift";
   - disownment

1. Cast off
   "She disowned her husband";
   - renounce, repudiate
    
2. Prevent deliberately (as by making a will) from inheriting
   "You cannot disown a child simply by failing to mention that child in your will";
   - disinherit

Type of: deprive, reject, renunciation, repudiation

Encyclopedia: Disowning