Synonyms and related words :
alternation, beat, cyclicalness, equivocation, fluctuation, intermittence, intermittency, meter, pendulation, pendulum motion, periodicalness, periodicity, piston motion, pulsation, reappearance, recurrence, regular wave motion, reoccurrence, return, rhythm, seasonality, seesawing, shifting, shilly-shally, shilly-shallying, shuffling, teeter-tottering, teetering, tottering, undulation, vacillation, variation, vicissitude, wavering, wobbling