American Heritage Dictionary
(3)
Century Dictionary
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GNU Webster's 1913
(1)
WordNet
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The reeds swayed in a quivering line of undulation, as though something were moving through them--something swift and mighty and terrible--and so it was.— The Sign of the Spider
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.— The Mind and the Brain Being the Authorised Translation of L'Âme et le Corps
Supposing that sensibility increases for the variable elements of the undulation, and becomes insensible for the constant elements.— The Mind and the Brain Being the Authorised Translation of L'Âme et le Corps
Vibration is the movement of a body in a state of tension,--undulation, that of a body absolutely lax.— The Storm-Cloud of the Nineteenth Century Two Lectures delivered at the London Institution February 4th and 11th, 1884
As it rolls in upon the shore the front of the undulation is retarded by the friction of the bottom in such a measure that its speed is diminished, while the following part of the waves, being less checked, crowds up toward this forward part.— Outlines of the Earth's History A Popular Study in Physiography

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