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Definitions of Mp:

noun: a military corps that enforces discipline and guards prisoners
noun: a member of the military police who polices soldiers and guards prisoners

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Alternative Terms
paris-m-tro-line-6 ratp rail-gauge rubber-tyred-metro electric-multiple-unit paris928-musical paris-m-tro mp-59 mp-89 mf-67 mf-77 mf-88 mf-2000 mp-military-police-officer barry-mather county-route-536