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

undulation

noun
 
/ˌʌndʒəˈleɪʃn/
 
/ˌʌndʒəˈleɪʃn/
[countable, uncountable]
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  1. a smooth, curving shape or movement like a series of waves
    • The road followed the undulations of the landscape.
See undulation in the Oxford Advanced American Dictionary
aspiration
noun
 
 
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