Definition of undulation noun from the Oxford Advanced Learner's Dictionary

 

undulation

 noun
noun
BrE BrE//ˌʌndjuˈleɪʃn//
 
; NAmE NAmE//ˌʌndʒəˈleɪʃn//
 
[countable, uncountable]
 
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a smooth curving shape or movement like a series of waves The road followed the undulations of the landscape.
See the Oxford Advanced American Dictionary entry: undulation