Pronunciation: (un"ju-lā'shun, un"dyu-, -du-), [key]
1. an act of undulating; a wavelike motion.
2. a wavy form or outline.
3. one of a series of wavelike bends, curves, or elevations.
a. a wave.
b. the motion of waves.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.