cadenced, cadent, continual, cyclic, cyclical, erratic, fluctuating, frequent, habitual, intermittent, measured, occasional, occurring again, oft-repeated, oftentime, patterned, perpetual, reappearing, recurrent, recurring, regular, regulated, remittent, repeated, returning, returning at intervals, rhythmic, rhythmical, seasonal, serial, sollemnis, spasmodic, sporadic, successive, systematic, variable
disjunctive (tending to disjoin), habitual, infrequent, intermittent, regular (orderly), repeated, sporadic
Burton's Legal Thesaurus. William C. Burton. 2006
adj.Occurring regularly at intervals.
The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. Amy Hackney Blackwell. 2008.