'Militia' definitions:

Definition of 'militia'

noun

Civilians trained as soldiers but not part of the regular army [syn: militia, reserves]

noun

The entire body of physically fit civilians eligible by law for military service; "their troops were untrained militia"; "Congress shall have power to provide for calling forth the militia"--United States Constitution

Definition of 'Militia'

From: GCIDE

Militia \Mi*li"tia\, n. [L., military service, soldiery, fr. miles, militis, soldier: cf. F. milice.] [1913 Webster]
1. In the widest sense, the whole military force of a nation, including both those engaged in military service as a business, and those competent and available for such service; specifically, the body of citizens enrolled for military instruction and discipline, but not subject to be called into actual service except in emergencies. [1913 Webster]
The king's captains and soldiers fight his battles, and yet . . . the power of the militia is he. --Jer. Taylor. [1913 Webster]
2. Military service; warfare. [Obs.] --Baxter. [1913 Webster]