regent

In a monarchy, if the king gets too sick to rule his country, a regent steps in to run things temporarily.

When kings or queens aren't able to do their jobs — because they're ill, or often because they are children — trusted advisers called regents fill in. You can think of a regent as a substitute monarch. There's also a more permanent kind of regent who helps to run a business or university and can also be called a trustee or board member. In Latin, regent means "ruling," from the verb regere, "to rule."

Definitions of regent
  1. noun
    someone who rules during the absence or incapacity or minority of the country's monarch
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    examples:
    Catherine de Medicis
    queen of France as the wife of Henry II and regent during the minority of her son Charles IX (1519-1589)
    type of:
    ruler, swayer
    a person who rules or commands
  2. noun
    members of a governing board
    synonyms: trustee
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    type of:
    committee member
    a member of a committee
  3. adjective
    acting or functioning as a regent or ruler
    “prince- regent
    Synonyms:
    powerful
    having great power or force or potency or effect
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