Etymology
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amplitude (n.)

1540s, "state or quality of being ample," from French amplitude or directly from Latin amplitudinem (nominative amplitudo) "wide extent, width," from amplus "large, spacious" (see ample). Amplitude modulation in reference to radio wave broadcast (as opposed to frequency modulation) first attested 1921, usually abbreviated A.M. Related: Amplitudinous.

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Definitions of amplitude

amplitude (n.)
(physics) the maximum displacement of a periodic wave;
amplitude (n.)
the property of copious abundance;
Synonyms: bountifulness / bounty
amplitude (n.)
greatness of magnitude;
From wordnet.princeton.edu