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Definition of undulation

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un·du·la·tion  audio  (nj-lshn, ndy-, -d-) KEY  

NOUN:
  1. A regular rising and falling or movement to alternating sides; movement in waves.
  2. A wavelike form, outline, or appearance.
  3. One of a series of waves or wavelike segments.



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The American Heritage® Dictionary of the English Language, Fourth Edition.
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