Definition of circadian adjective from the Oxford Advanced American Dictionary

 

circadian

 adjective
adjective
NAmE//sərˈkeɪdiən//
 
[only before noun](technology)
 
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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.
See the Oxford Advanced Learner's Dictionary entry: circadian