Webster's English Dictionary

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amplitude

am.pli.tude \-.t(y)u:d\ n 1: the quality or state of being ample : FULLNESS 
    2: the extent or range of a quality, property, process, or phenomenon : as 
    2a: the extent of a vibratory movement (as of a pendulum) measured from 
   the mean position to an extreme 2b: the maximum departure of the value of 
   an alternating current or wave from the average value 3: the arc of the 
   horizon between the true east or west point and the foot of the vertical 
   circle passing through any star or object