undulation

[uhn-juh-ley-shuhn, uhn-dyuh-, -duh-]
noun
1.
an act of undulating; a wavelike motion.
2.
a wavy form or outline.
3.
one of a series of wavelike bends, curves, or elevations.
4.
Physics.
a.
a wave.
b.
the motion of waves.

Origin:
1640–50; undul(ate) + -ation

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World English Dictionary
undulation (ˌʌndjʊˈleɪʃən)
 
n
1.  the act or an instance of undulating
2.  any wave or wavelike form, line, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

undulation
1640s, from M.L. *undulatio, from L.L. undulatus "wavy, undulated," from undula "wavelet," dim. of L. unda "wave" (see water).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The top edge is a triumph of undulation and its handle a swirl of curling leaves and clever loops.
She demonstrated a snakelike undulation of the arms and upper body called the cobra.
He must be always on his guard and devote every minute and module of life to the decoding of the undulation of things.
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