undulation
noun/ˌʌndʒəˈleɪʃn/
/ˌʌndʒəˈleɪʃn/
[countable, uncountable]- a smooth, curving shape or movement like a series of waves
- The road followed the undulations of the landscape.
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undulation
Definition of undulation noun from the Oxford Advanced Learner's Dictionary
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