Circular – Cyclical – Circadian

from rhythm, to flow (also to flood), to circular, to cyclical, to circadian:
circular

/ˈsəːkjʊlə/

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adjective
adjective: circular
  1. 1.
    having the form of a circle.
    “the building features a circular atrium”
    synonyms: rounddisc-shapeddisc-likeMore

    • (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”
  2. 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”
  3. 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
  1. 1.
    a letter or advertisement which is distributed to a large number of people.
    “I received a circular from a building society”
    synonyms: leafletpamphlethandbillMore

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
  1. occurring in cycles; recurrent.
    “the cyclical nature of the cement industry”
    synonyms: recurrentrecurring, happening at regular intervals, regularrepeatedrepetitiveMore

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circadian

/səːˈkeɪdɪən/

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adjective

PHYSIOLOGY
adjective: circadian
  1. (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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