Webster's English Dictionary

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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