regent

/ˈridʒənt/
noun
  1. A person who rules a country temporarily when the monarch is absent, too young, or unable to rule.
    • The queen appointed her cousin as regent while she traveled abroad for medical treatment.
    • When the king fell ill, the regent managed the kingdom's affairs until he recovered.
    • The young prince was only five, so his mother served as regent until he came of age.
  2. A member of a governing board, especially for a university or educational institution.
    • As a regent, he helped decide the school's budget and policies.
    • The board of regents voted to increase tuition for the next academic year.
    • She was elected as a regent of the state university system.
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Antonyms
adjective
  1. Acting as a regent; serving as a temporary ruler.
    • During the regent period, many important laws were passed.
    • The prince regent governed in place of his ailing father.
    • She held the title of queen regent for over a decade.