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undulation (n.)

1640s, from Medieval Latin *undulatio, from Late Latin undulatus "wavy, undulated," from undula "wavelet," diminutive of Latin unda "a wave," from PIE *unda-, nasalized form of root *wed- (1) "water; wet."

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Definitions of undulation

undulation (n.)
an undulating curve;
Synonyms: wave
undulation (n.)
wavelike motion; a gentle rising and falling in the manner of waves;
undulation (n.)
(physics) a movement up and down or back and forth;
Synonyms: wave
From wordnet.princeton.edu