(a.) Moving, or characterized by motion, backward and forward like a pendulum; swinging; oscillating; vibratory; as, oscillatory motion.

alternate beating circling cyclic epochal even every other fluctuant fluctuating fluctuational harmonic intermittent isochronal libratory measured metronomic nutational oscillating pendular pendulating pendulous periodic periodical pulsing reciprocal recurrent recurring resonant rhythmic rotary seasonal serial shilly-shally shilly-shallying steady undulant undulatory vacillating vacillatory vibratile vibrating vibratory wavelike wavering wheeling wobbly