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An instrument other than a watch for measuring or indicating time, especially a mechanical or electronic device having a numbered dial and moving hands or a digital display.
(noun)
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A time clock.
(noun)
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A source of regularly occurring pulses used to measure the passage of time, as in a computer.
(noun)
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Any of various devices that indicate measurement, such as a speedometer or a taximeter.
(noun)
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A biological clock.
(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.