From The Collaborative International Dictionary of English v.0.48 [gcide]:
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.
From WordNet (r) 3.0 (2006) [wn]:
2: 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
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