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cir·ca·di·an(sər-kā′dē-ən, -kăd′ē-, sûr′kə-dī′ən, -dē′-)
Relating to or exhibiting approximately 24-hour periodicity.
(Biology) of or relating to biological processes that occur regularly at about 24-hour intervals, even in the absence of periodicity in the environment. See also biological clock
[C20: from Latin circa about + diēs day]
cir•ca•di•an(sɜrˈkeɪ di ən, ˌsɜr kəˈdi ən)
of or pertaining to rhythmic cycles recurring at approximately 24-hour intervals: the circadian biological clock.
[1955–60; < Latin circā about + di(ēs) day + -an1]
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|Adj.||1.||circadian - of or relating to biological processes occurring at 24-hour intervals; "circadian rhythms"|