Definition of circadian adjective from the Oxford Advanced Learner's Dictionary

 

circadian

 adjective
adjective
BrE BrE//sɜːˈkeɪdiən//
 
; NAmE NAmE//sɜːrˈkeɪdiən//
 
[only before noun](specialist)
 
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connected with the changes in the bodies of people or animals over each period of 24 hours Jet lag occurs because jet travel ignores the circadian timekeeper. Word Origin 1950s: formed irregularly from Latin circa ‘about’ + dies ‘day’.
See the Oxford Advanced American Dictionary entry: circadian