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The Collaborative International Dictionary of English v.0.48 (gcide)

Undulation \Un`du*la"tion\, n. [Cf. F. ondulation.]
1. The act of undulating; a waving motion or vibration; as,
the undulations of a fluid, of water, or of air; the
undulations of sound.
[1913 Webster]

2. A wavy appearance or outline; waviness. --Evelyn.
[1913 Webster]

3. (Mus.)
(a) The tremulous tone produced by a peculiar pressure of
the finger on a string, as of a violin.
(b) The pulsation caused by the vibrating together of two
tones not quite in unison; -- called also {beat}.
[1913 Webster]

4. (Physics) A motion to and fro, up and down, or from side
to side, in any fluid or elastic medium, propagated
continuously among its particles, but with no translation
of the particles themselves in the direction of the
propagation of the wave; a wave motion; a vibration.
[1913 Webster]

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