UNDULATION
wave, undulation
(noun) (physics) a movement up and down or back and forth
undulation
(noun) wavelike motion; a gentle rising and falling in the manner of waves
wave, undulation
(noun) an undulating curve
Source: WordNet® 3.1
Etymology
Noun
undulation (countable and uncountable, plural undulations)
An instance or act of undulating.
A wavy appearance or outline; waviness.
(music) A tremulous tone produced by a peculiar pressure of the finger on a string.
A wavelike curve; a smooth and regular rise and fall.
A wavelike motion of the air; electromagnetic radiation.
(medicine, dated) A feeling as if of an undulatory motion about the heart.
(medicine, dated) The distinctive motion of the matter within an abscess on being pressed when it is ripe for opening.
Source: Wiktionary
Un`du*la"tion, n. Etym: [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.
2. A wavy appearance or outline; waviness. Evelyn.
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.
4. (Physics)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition