(Physics) a movement up and down or back and forth.
1 A slinking gray shadow crossed the undulation and disappeared in the thicket.
2 Suddenly the creature began shaking his head in a slow, rhythmic undulation .
3 The airy undulation , and the shock given to my nerves, were real.
4 Often it is their undulation only which reveals the water beneath them.
5 A wickedly carnal undulation of pleasure vibrated through her pulsing body.
6 It rose and fell, an undulation of what might have been adamant anger.
7 I could see her legs kicking, and the silvery undulation of her hair.
8 In undulation , not one wave is like another; in vibration, every pulse is alike.
9 Walls and roof shut it off as they shut off the undulation of light.
10 The course for the next four or five hundred feet had but little undulation .
11 Rage turned and saw the graceful undulation of sand dunes.
12 Jolober had gone down the steps in a smooth undulation .
13 At the top of the highest undulation he stopped, and glowered back along the trail.
14 The raft is motionless in the midst of a dark heavy sea-without undulation , without motion.
15 He rocked a little on his hind feet, that ominous undulation which portends the charge.
16 At this speed, there's a peculiar vibration, a sort of undulation of the thundering machine.
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