WordWeb Online

1. Conformable to or allowed by law
   "lawful methods of dissent"
    
2. According to custom or rule or natural law
   - rule-governed
    
3. Having a legally established claim
   "the true and lawful king"
   - true, rightful
    
4. Authorized, sanctioned by, or in accordance with law
   - legitimate, licit

See also: law-abiding, lawfully, lawfulness, lawlessly, legal, legitimate, observant, regular, square, straight

Antonym: unlawful

Encyclopedia: Lawful