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.

plural of undulation

(transitive) To cause to move in a wavelike motion. / (transitive) To cause to resemble a wave / (intransitive) To move in wavelike motions. / (intransitive) To appear wavelike.

Wavy in appearance or form. / Changing the pitch and volume of one's voice. / (botany, of a margin) sinuous, winding up and down.

simple past tense and past participle of undulate

Third-person singular simple present indicative form of undulate

undulation

Moving up and down like waves; wavy. / Forming a series of regular curves.

present participle of undulate

Having the characteristics of a wave; wavelike