WordWeb Online

1. Disagreeing, especially with a majority
   - dissentient, dissident

1. Withhold assent
   "Several Republicans dissented"
    
2. Express opposition through action or words
   "dissent to the laws of the country";
   - protest, resist
    
3. Be of different opinions
   "She dissents with her husband on many questions";
   - disagree, differ, take issue

See also: negative

Type of: contradict, controvert, oppose

Antonym: assent

Encyclopedia: Dissenting