oscillation
os.cil.la.tion \.a:s-*-'la--sh*n\ \-shn*l, -sh*n-*l\ n 1: the act or fact of oscillating : VIBRATION 2: VARIATION, FLUCTUATION 3: a flow of electricity changing periodically from a maximum to a minimum; esp : a flow periodically changing direction 4: a single swing (as of an oscillating body) from one extreme limit to the other - os.cil.la.tion.al aj