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



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 Origin1950s: formed irregularly from Latin circa ‘about’ + dies ‘day’.
See the Oxford Advanced American Dictionary entry: circadian