Definition from Wiktionary, the free dictionary
The use of "militia" rather than "police" to refer to the police force (of Russia and some other countries) originated among Russian communists.
militia (plural militias)
- (in particular) An army of trained civilians, which may be an official reserve army, called upon in time of need, the entire able-bodied population of a state which may also be called upon, or a private force not under government control.
- The national police force of certain countries (e.g. Russia, Ukraine).
army of trained civilians called upon in time of need
From mīles (“soldier”).
- military service; soldiery, military
- warfare, war, campaign
- civil service, profession, employment
- (figuratively) military spirit, courage, bravery