- periodically
- advintermittently, alternately, remit-tently, recurrently, cyclically; episodically, spasmodically, sporadically; occasionally, infrequently, frequently, rarely, from time to time, now and then, once in a while, now and again, off and on; regularly, repeatedly, repetitiously, redundantly; systematically, rhythmically, isochronally; annually, biannually, monthly, weekly, daily, nightly; night after night, day after day, week after week, month after month, year after year, down through the centuries, down through the years.
A Note on the Style of the synonym finder. 2014.