regularity of recurrence. periodicity

periodicity, intermittence; beat; oscillation; pulse, pulsation; rhythm; alternation, alternateness, alternativeness, alternity., bout, round, revolution, rotation, turn, say., anniversary, jubilee, centenary., catamenia; courses, menses, menstrual flux., [Regularity of return] rota, cycle, period, stated time, routine; days of the week; Sunday, Monday, etc.; months of the year; January, etc.; feast, fast; Christmas, Easter, New Year's day., Allhallows, Allhallowmas, All Saints' Day; All Souls', All Souls' Day; Ash Wednesday, bicentennial, birthday, bissextile, Candlemas, Dewali, Groundhog Day [U.S.], Halloween, Hallowmas, Lady day, leap year, Midsummer day, Muharram, Woodchuck Day [U.S.], St. Swithin's day, natal day; yearbook; yuletide., punctuality, regularity, steadiness.

recur in regular order, recur in regular succession; return, revolve; come again, come in its turn; come round, come round again; beat, pulsate; alternate; intermit.

periodic, periodical; serial, recurrent, cyclical, rhythmical; recurring; intermittent, remittent; alternate, every other., hourly; diurnal, daily; quotidian, tertian, weekly; hebdomadal, hebdomadary; biweekly, fortnightly; bimonthly; catamenial; monthly, menstrual; yearly, annual; biennial, triennial; centennial, secular; paschal, lenten, etc., regular, steady, punctual, regular as clockwork.

periodically; at regular intervals, at stated times; at fixed times, at established times, at established periods; punctually; de die in diem; from day to day, day by day., by turns; in turn, in rotation; alternately, every other day, off and on, ride and tie, round and round.