Definition of undulation
1a
: a rising and falling in waves
b
: a wavelike motion to and fro in a fluid or elastic medium propagated continuously among its particles but with little or no permanent translation of the particles in the direction of the propagation : vibration
2
: the pulsation caused by the vibrating together of two tones not quite in unison
3
: a wavy appearance, outline, or form : waviness
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Merriam-Webster unabridged
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Time Traveler for undulation
The first known use of undulation was in 1646
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