amplitude /ˈamplɪtjuːd/

a

I. noun [ mass noun]

1.
[Physics] the maximum extent of a vibration or oscillation, measured from the position of equilibrium.

the amplitude of alpha rhythms.
[ count noun]
waves with amplitudes greater than or equal to 20 mm.
2. the maximum difference of an alternating electric current or potential from the average value.

the detection of signals only a few microvolts in amplitude.
3.
[Astronomy] the angular distance of a celestial object from the true east or west point of the horizon at rising or setting.
4. breadth, range, or magnitude

the amplitude of the crime of manslaughter lies beneath murder.
5.
[Mathematics] the angle between the real axis of an Argand diagram and a vector representing a complex number.
– origin mid 16th cent. (in the senses ‘physical extent’ and ‘grandeur’): from Latin amplitudo, from amplus ‘large, abundant’.

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