from rhythm, to flow (also to flood), to circular, to cyclical, to circadian:
circular
/ˈsəːkjʊlə/
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adjective
adjective: circular
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1.having the form of a circle.“the building features a circular atrium”
synonyms: round, disc-shaped, disc-like; More -
(of a movement or journey) starting and finishing at the same place and often following roughly the circumference of an imaginary circle.“a circular walk”
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2.LOGIC(of an argument) already containing an assumption of what is to be proved, and therefore fallacious.“the reality of standard English rests on the circular argument that that is good which good users use”
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3.(of a letter or advertisement) for distribution to a large number of people.“a circular letter was sent asking for support”
noun
noun: circular; plural noun: circulars
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1.a letter or advertisement which is distributed to a large number of people.“I received a circular from a building society”
synonyms: leaflet, pamphlet, handbill; More
Origin
late Middle English: from Old French circulier, from late Latin circularis, from Latin circulus ‘small ring’ (see circle).
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cyclical
/ˈsɪklɪk(ə)l/
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adjective
adjective: cyclical
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occurring in cycles; recurrent.“the cyclical nature of the cement industry”
synonyms: recurrent, recurring, happening at regular intervals, regular, repeated, repetitive; More
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circadian
/səːˈkeɪdɪən/
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adjective
PHYSIOLOGY
adjective: circadian
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(of biological processes) recurring naturally on a twenty-four-hour cycle, even in the absence of light fluctuations.“a circadian rhythm”
Origin
1950s: formed irregularly from Latin circa ‘about’ + dies ‘day’.
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