Undulation is a flowing, up-and-down movement like the motion of waves.

Have you ever looked out over the ocean and watched the water flow up and down in waves? If so, you watched undulation, which is exactly that type of movement. Undulation best applies to waves, but it can also describe similar movements. If dancers are moving in a flowing manner, that's also undulation. The verb form of this word is undulate, and both come from the Latin word for "wave," unda.

Definitions of undulation
  1. noun
    wavelike motion; a gentle rising and falling in the manner of waves
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    type of:
    motion, movement
    a natural event that involves a change in the position or location of something
  2. noun
    (physics) a movement up and down or back and forth
    synonyms: wave
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    show 20 types...
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    gravitation wave, gravity wave
    (physics) a wave that is hypothesized to propagate gravity and to travel at the speed of light
    sine wave
    a wave whose waveform resembles a sine curve
    oscillation, vibration
    (physics) a regular periodic variation in value about a mean
    a wave motion
    a wave on the surface of a lake or landlocked bay; caused by atmospheric or seismic disturbances
    standing wave, stationary wave
    a wave (as a sound wave in a chamber or an electromagnetic wave in a transmission line) in which the ratio of its instantaneous amplitude at one point to that at any other point does not vary with time
    traveling wave, travelling wave
    a wave in which the medium moves in the direction of propagation of the wave
    acoustic wave, sound wave
    (acoustics) a wave that transmits sound
    wave form, wave shape, waveform
    the shape of a wave illustrated graphically by plotting the values of the period quantity against time
    blast wave, shock wave
    a region of high pressure travelling through a gas at a high velocity
    impulse, pulsation, pulse, pulsing
    (electronics) a sharp transient wave in the normal electrical state (or a series of such transients)
    flap, flapping, flutter, fluttering
    the motion made by flapping up and down
    (electronics) an oscillation of small amplitude imposed on top of a steady value
    solitary wave, soliton, soliton wave
    (physics) a quantum of energy or quasiparticle that can be propagated as a traveling wave in nonlinear systems and is neither preceded nor followed by another such disturbance; does not obey the superposition principle and does not dissipate
    air wave
    a sound wave that is transmitted via air
    (physics) a short-lived oscillation in a system caused by a sudden change of voltage or current or load
    sonic boom
    an explosive sound caused by the shock wave of an airplane traveling faster than the speed of sound
    a single pulsation of an oscillation produced by adding two waves of different frequencies; has a frequency equal to the difference between the two oscillations
    a vibration of large amplitude produced by a relatively small vibration near the same frequency of vibration as the natural frequency of the resonating system
    sympathetic vibration
    (physics) vibration produced by resonance
    type of:
    motion, movement
    a natural event that involves a change in the position or location of something
  3. noun
    an undulating curve
    synonyms: wave
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    sine curve, sinusoid
    the curve of y=sin x
    type of:
    curve, curved shape
    the trace of a point whose direction of motion changes
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