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undulation

[uhn-juh-ley-shuh n, uhn-dyuh-, -duh-] /ˌʌn dʒəˈleɪ ʃən, ˌʌn dyə-, -də-/
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.
  1. a wave.
  2. the motion of waves.
Origin of undulation
1640-1650
1640-50; undul(ate) + -ation
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for undulation

undulation

/ˌʌndjʊˈleɪʃən/
noun
1.
the act or an instance of undulating
2.
any wave or wavelike form, line, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for undulation
n.

1640s, from Medieval Latin *undulatio, from Late Latin undulatus "wavy, undulated," from undula "wavelet," diminutive of Latin unda "wave" (see water).

Online Etymology Dictionary, © 2010 Douglas Harper
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