Largeness; extent; breadth or range. [L. amplitudo, fr. amplus, large]
* * *
1) the extent or range of a quality, property, process, or phenomenon: as
a) the extent of a vibratory movement (as of a pendulum) measured from the mean position to an extreme
b) the maximum departure of the value of an alternating current or wave from the average value
* * *
am·pli·tude (amґplə-t
d) [L. amplus full] 1. largeness or fullness; wideness or breadth of range or extent. 2. in a phenomenon that occurs in waves, the maximal deviation of a wave from the baseline, measured as either peak a. or peak-to-peak a.
Medical dictionary. 2011.