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Definition of periodic:

  1. Alt. of Periodical
  2. Pertaining to, derived from, or designating, the highest oxygen acid ( HIO) of iodine.


oscillating, infrequent, rhythmical, casual, cyclic, (every) now and then/again, recurring, pulsed, intermittent, sporadic, sometimes, periodical, isochronal, occasionally, occasional, every so often, oscillatory, from time to time, episodic, continue, repetition, spasmodic, fitful, rhythmic, repeated, on-and-off, study at intermittent, isochronous.

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