What is the meaning of militant?

noun

• A militant reformer.
  • synonyms: activist

adjective

• Disposed to warfare or hard-line policies.
  • usage: "militant nations"; "hawkish congressman"; "warlike policies"
  • synonyms: hawkish, warlike
• Showing a fighting disposition.
  • usage: "highly competitive sales representative"; "militant in fighting for better wages for workers"; "his self-assertive and ubiquitous energy"
  • synonyms: competitive
• Engaged in war.
  • usage: "belligerent (or warring) nations"
  • synonyms: belligerent, war-ridden, warring