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noun\ˌən-jə-ˈlā-shən, ˌən-dyə-, ˌən-də-\
Definition of UNDULATION
a: 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
: the pulsation caused by the vibrating together of two tones not quite in unison