Definition of monarch
1
: a person who reigns over a kingdom or empire: such as
a
: a sovereign ruler
b
: a constitutional (see constitutional entry 1 sense 3) king or queen
2
: one that holds preeminent position or power
cotton, monarch of the textile world — Wall Street Journal
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Merriam-Webster unabridged
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Time Traveler for monarch
The first known use of monarch was in the 15th century
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