1) Undulation 2) Wave 
[adj] - of or relating to or characterized by vibration
vibration, vibrational 1. The act of vibrating, or the state of being vibrated, or in vibratory motion; quick motion to and fro; oscillation, as of a pendulum or musical string. 2. A limited reciprocating motion of a particle of an elastic body or medium in alternately opposite directions from its position of equilibrium, when that equilibrium has...
adjective of or relating to or characterized by vibration