| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | 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 certain occasions, on-again-off-again, orbital, perennial, periodical, recurrent, recurring, regular, repeated, rhythmic, routine, seasonal, serial, spasmodic, sporadic, weekly, yearly |
| Notes: | periodic means happening or recurring at regular intervals; sporadic means occurring singly or occasionally or in scattered instances |
| Antonyms: | constant, continual, irregular, lasting, permanent, sporadic, variable |