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{%type%} Definitions

WordNet 3.0Copyright Princeton University
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Short "hint"

n. - (physics) a movement up and down or back and forth; Wavelike motion.

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Usage examples (37)
  • There are two motions of the waves -- one up and down, which we call undulation, the other to and fro, which we call fluctuation.
  • The undulation is the work of two collaborators: it expresses both the nature of the object which provokes it and that of the nervous apparatus which is its vehicle.
  • There is a kind of undulation in the popularity of the great writers, even of the first rank.
  • No undulation of air can there convey sound, song, or speech.
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The Open Dictionary of English is a collaborative project, based on Open Source materials, LearnThat resources, and partner APIs.
We give special thanks to our LearnThat volunteers, as well as Princeton University and Wiktionary for their Open Source word data. We're also grateful for the support given by Google, Wordnik.com, Dictionary.com, Stands4.com and YouTube, OEDILF.com, Kylescholz.com, Best-Practice.com, Forvo.com, as well as the generous Creative Commons community.