Synonyms and related words :
alternate, beating, circling, consequential, cyclic, even, every other, far-reaching, important, intermittent, isochronal, measured, metronomic, momentous, oscillatory, periodical, pulsing, reciprocal, recurrent, recurring, rhythmic, rotary, seasonal, serial, steady, undulant, undulatory, unmatched, unparalleled, wavelike, wheeling