A well-regulated this, begins the 2nd Amendment

noun

1. A part of the organized armed forces of a country liable to call only in emergency

   "The militia was called to quell the riot."

2. A body of citizens organized for military service
3. The whole body of able-bodied male citizens declared by law as being subject to call to military service
4. A private group of armed individuals that operates as a paramilitary force and is typically motivated by a political or religious ideology