What is the meaning of lawful?

adjective

• Conformable to or allowed by law.
  • usage: "lawful methods of dissent"
• According to custom or rule or natural law.
  • synonyms: rule-governed
• Having a legally established claim.
  • usage: "the legitimate heir"; "the true and lawful king"
  • synonyms: true, rightful
• Authorized, sanctioned by, or in accordance with law.
  • usage: "a legitimate government"
  • synonyms: legitimate, licit