internal clock
Americannoun
Etymology
Origin of internal clock
First recorded in 1955–60
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Almost all cells in the body contain their own internal clock, which can be influenced by light, physical activity, and food timing.
From Science Daily ● Jan. 3, 2026
My internal clock wherever I am just knows it’s 4 p.m. and I get a little sad.
From Los Angeles Times ● Jul. 25, 2025
When it is bright, our internal clock feels we should be awake.
From BBC ● Apr. 16, 2025
You really have to be thoughtful of your act structures and that internal clock.
From Salon ● Aug. 12, 2024
No. His internal clock doesn’t work that way.
From "Flying to the Moon: An Astronaut's Story" by Michael Collins
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
