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See also: periòdic


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Alternative forms[edit]

Etymology 1[edit]

From French périodique, from Medieval Latin periodicus (cyclical), from Latin periodus (complete sentence, period, circuit), from Ancient Greek περίοδος (periodos, cycle, period of time).


  • (UK) IPA(key): /pɪ.ɹiˈɒdɪk/
  • (file)
  • Rhymes: -ɒdɪk
    A graph of the sine function, a periodic function.


periodic (not comparable)

  1. Relative to a period or periods.
  2. Having repeated cycles.
  3. Occurring at regular intervals.
  4. periodical
  5. (astronomy) Pertaining to the revolution of a celestial object in its orbit.
  6. (mathematics, stochastic processes, of a state) for which any return to it must occur in multiples of k time steps, for some k>1.
  7. (rhetoric) Having a structure characterized by periodic sentences.
  8. (chemistry) Relating to, derived from, or designating, the highest oxygen acid (HIO) of iodine.
Derived terms[edit]
Related terms[edit]
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Etymology 2[edit]

per- +‎ iodic


  • enPR: "pûrīŏd'ĭk, IPA(key): /ˌpɜːraɪˈɒdɪk/


periodic (not comparable)

  1. Of or derived from a periodic acid.
Derived terms[edit]



periodic m plural

  1. plural form of periodich