N. 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, rota, cycle, period, stated time, routine, days of the week, sunday, monday &c, months of the year, january &c, feast, fast &c, christmas, easter, new year's day &c. allhallows, allhallowmas, all saints' day, all souls', all souls' day, ash wednesday, bicentennial, birthday, bissextile, candlemas, dewali, groundhog day, halloween, hallowmas, lady day, leap year, midsummer day, muharram, woodchuck day, st. swithin's day, natal day, yearbook, yuletide, punctuality, regularity, steadiness

V. 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

Adj. 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, &c, centennial, secular, paschal, lenten, &c. regular, steady, punctual, regular as clockwork

Adv. periodically, at regular intervals, at stated times, at fixed established, 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