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Definition of circadian

circadian

/sɜːrˈkeɪdiən/
cir · ca · di · an
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circadian Lexical Profile

circadian Game Scores & Validity

• adjective

1

Relating to or exhibiting biological processes or behavioral rhythms that occur naturally on an approximately twenty-four-hour cycle.

Example

"Exposure to natural sunlight in the morning helps regulate the body's circadian rhythm and improves sleep quality."

Synonyms
View all synonyms for circadian

Word Nuance & Usage

Do not confuse 'circadian' (occurring in a roughly 24-hour cycle) with 'diurnal' (occurring or active during the daytime as opposed to night).

• Rhymes for circadian

• Nearby Words

cinquefoil
cipher
circa
circadian
circle
circlet
circuit

Word Origin & Etymology

Coined in 1959 by chronobiologist Franz Halberg from the Latin roots 'circa' (meaning 'around' or 'about') and 'dies' (meaning 'day').

Cite this Entry

Wordmom. (2026). Definition of Circadian. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/circadian
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