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

What is a undulation meaning?

1a : a rising and falling in waves. b : a wavelike motion to and fro in a fluid or elastic medium propagated continuously among its particles but with little or no permanent translation of the particles in the direction of the propagation : vibration.

What are the two meanings of spruce?

Definition of spruce (Entry 2 of 3) : neat or smart in appearance : trim. spruce. noun. plural spruces also spruce.