noun
a mechanical or electrical device for measuring time, indicating hours, minutes, and sometimes seconds by hands on a round dial or by displayed figures
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The clock on the wall struck twelve, signaling the end of the meeting.
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I'll meet you at the coffee shop at six o'clock.
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I need to hurry up and finish this assignment before the clock runs out.
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Time is ticking away like a clock, we need to make a decision soon.