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undulation [undulations]▼(instance or act)noun[UK: ˌʌn.djʊ.ˈleɪʃ.n̩] [US: ˌʌn.djʊ.ˈleɪʃ.n̩]
wave [waves]▼(moving disturbance, undulation)noun[UK: weɪv] [US: ˈweɪv]
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