(also Re·gent ) / ˈriːdʒənt; NAmE / noun
a person who rules a country because the king or queen is too young, old, ill / sick, etc. :
to act as regent
► re·gent (also Re·gent ) adjective [ after noun ]:
the Prince Regent
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WORD ORIGIN
late Middle English : from Old French , or from Latin regent- ruling, from the verb regere .