alternation, beat, cyclicalness, doubling, duplication, echo, imitation, intermittence, intermittency, meter, oscillation, pendulum motion, periodicalness, periodicity, piston motion, plagiarism, pulsation, quotation, reappearance, rebirth, recurrence, redoubling, reduplication, reecho, regular wave motion, regurgitation, reincarnation, renewal, repetition, reproduction, resumption, return, rhythm, seasonality, undulation