the period during which a monarch is the official ruler of a country
2.
a period during which a person or thing is dominant, influential, or powerful: the reign of violence is over
—vb
3.
to exercise the power and authority of a sovereign
4.
to be accorded the rank and title of a sovereign without having ruling authority, as in a constitutional monarchy
5.
to predominate; prevail: a land where darkness reigns
6.
(usually present participle) to be the most recent winner of a competition, contest, etc: the reigning heavyweight champion
usage Reign is sometimes wrongly written for rein in certain phrases: he gave full rein (not reign) to his feelings; it will be necessary to rein in (not reign in) public spending
early 13c., "kingdom," from O.Fr. reigne, from L. regnum "kingship, dominion, rule, realm," related to regere (see regal). Meaning "period of rule" first recorded mid-14c. The verb, meaning "to hold or exercise sovereign power," is attested from late 13c., from O.Fr. regner,