Adjective periodic has 3 senses
  1. periodic, periodical - happening or recurring at regular intervals
    Antonyms: aperiodic, nonperiodic, noncyclic, nonoscillatory
  2. periodic - recurring at regular intervals
    Antonyms:
    unrhythmical, unrhythmic (indirect, via rhythmical)
  3. periodic - recurring or reappearing from time to time; "periodic feelings of anxiety"
    Antonym:
    continual (indirect, via sporadic)
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