Definitions from Wiktionary (undulation)

▸ noun:  An instance or act of undulating.
▸ noun:  A wavy appearance or outline; waviness.
▸ noun:  (music) A tremulous tone produced by a peculiar pressure of the finger on a string.
▸ noun:  A wavelike curve; a smooth and regular rise and fall.
▸ noun:  A wavelike motion of the air; electromagnetic radiation.
▸ noun:  (medicine, dated) A feeling as if of an undulatory motion about the heart.
▸ noun:  (medicine, dated) The distinctive motion of the matter within an abscess on being pressed when it is ripe for opening.
▸ Also see undulation

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