Periodic

مترادف و متضاد periodic

1. adjective at fixed intervals
   Synonyms: alternate, annual, at various times, centennial, cyclic, cyclical, daily, epochal, every once in a while, every so often, fluctuating, hourly, infrequent, intermittent, isochronal, isochronous, monthly, occasional, on-again-off-again, on certain occasions, orbital, perennial, periodical, recurrent, recurring, regular, repeated, rhythmic, routine, seasonal, serial, spasmodic, sporadic, weekly, yearly
   Antonyms: constant, continual, irregular, lasting, permanent, sporadic, variable