internal clock

1955–60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To internal clock's 21st Century Lexicon
Main Entry:  internal clock1
Part of Speech:  n
Definition:  a person's innate sense of time
Main Entry:  internal clock2
Part of Speech:  n
Definition:  biological clock; the system of timing of biological reactions within an organism's 21st Century Lexicon
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Example sentences
He's simply one of those people whose internal clock is off.
When someone set the alarm in the internal clock, they would click on a picture
  of a rooster.
Most animals and plants follow an internal clock timed to the rising and
  setting of the sun--the so-called circadian rhythm.
Active kids produce more melatonin, a natural hormone that serves as the body's
  internal clock and calendar.
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