Amplitude
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
Amplitude is defined as the maximum distance from the equilibrium position during harmonic oscillatory motion, such as the swing of a pendulum or vibration of a string. In mathematics, it refers to the greatest value that a periodic function can attain during its variations.
Encyclopedia entry (1928–1936)
AMPLITUDE (from the Latin amplitudo - extensiveness, magnitude), the greatest distance from the equilibrium position during harmonic oscillatory movement. Examples: the maximum deviation of a pendulum, the maximum deflection of a vibrating string, half the distance between the highest and lowest points during the oscillation of an elastic beam, etc. In mathematics, amplitude is called the greatest value that a periodic function can assume during its variations.
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“Amplitude.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.pages.dev/article/amplitude/