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One appointed or elected to preside over an organized body of people, such as an assembly or meeting.
(noun)
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The chief executive of a republic.
(noun)
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The chief executive of the United States, serving as both chief of state and chief political executive.
(noun)
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The chief officer of a branch of government, corporation, board of trustees, university, or similar body.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.