D defs.my
Entry 2 senses Webster, 1913

Régime

/(r?`zh?m")/ · Ré·gime · IPA
01 n. Mode or system of rule or management; character of government, or of the prevailing social system.
  1. 1.
    Mode or system of rule or management; character of government, or of the prevailing social system.
    “I dream . . . of the new régime which is to come.” — H. Kingsley.
  2. 2.
    The condition of a river with respect to the rate of its flow, as measured by the volume of water passing different cross sections in a given time, uniform régime being the condition when the flow is equal and uniform at all the cross sections.(Hydraul.)
Phrases & compounds
The ancient régime — the former political and social system, as distinguished from the modern; especially, the political and social system existing in France before the Revolution of 1789.