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
Also the greens are firm and fast, plus the undulations.
Researchers say the undulations ensure each penguin a turn in the middle of the cluster, which helps the birds keep warm.
Seemingly random slow undulations are caused by wind slowly rocking the ground.
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