noun
(military) A unit of armed troops under the command of an officer, and consisting of several smaller units.
(now rare, archaic) Rule or governance over a person, place etc.; government, authority.
(obsolete) The state or office of a ruler; rulership.
(obsolete) Influence or control exercised by someone or something (especially a planet).
(obsolete) A place under a particular rule; a kingdom or domain.
(obsolete, medicine) A regimen.
verb
(transitive) To form soldiers into a regiment.
(transitive) To systematize, or put in rigid order.