There are two motions of the waves -- one up and down, which we call undulation, the other to and fro, which we call fluctuation.    From Wordnik.com.  [George Müller of Bristol And His Witness to a Prayer-Hearing God] Reference

The undulation is the work of two collaborators: it expresses both the nature of the object which provokes it and that of the nervous apparatus which is its vehicle.    From Wordnik.com.  [The Mind and the Brain Being the Authorised Translation of L'Âme et le Corps] Reference

There is a kind of undulation in the popularity of the great writers, even of the first rank.    From Wordnik.com.  [Memoirs of Margaret Fuller Ossoli, Volume I] Reference

No undulation of air can there convey sound, song, or speech.    From Wordnik.com.  [Moon Lore] Reference

And of this undulation, not the foot, but the line is the unit.    From Wordnik.com.  [The Principles of Aesthetics] Reference

Each undulation of the curves corresponds to a hundredth of a second.    From Wordnik.com.  [Scientific American Supplement, No. 421, January 26, 1884] Reference

This wedding -- The Chelsea Clinton Wedding -- has a different undulation to it.    From Wordnik.com.  [Janice Taylor: Weight Loss: Chelsea Clinton's Wedding--Who's Fat?] Reference

An undulation set in movement by my entrance passed through the length of the saloon.    From Wordnik.com.  [Cord and Creese] Reference

Many animals live among the kelp, and the slow undulation of its leaves is beautiful.    From Wordnik.com.  [The Arctic Life] Reference

The efficient undulation of his legs sends him higher, faster, the water hurtling past him.    From Wordnik.com.  [Darkness of the Light] Reference

The ridge or undulation, at the top of which we at last arrived, had quite an imposing effect.    From Wordnik.com.  [The South Pole~ Through the Mountains] Reference

The greens are the slickest and most complicated in golf, riddled with subtlety and undulation.    From Wordnik.com.  [Matthew DeBord: Rules of Golf: What You Need to Know Before You Watch the Masters with the Golf Lover in Your Life] Reference

On the sea bed billow acres of low-growing kelp, whose undulation is as mesmerizing as a Bach fugue.    From Wordnik.com.  [Beneath the Ice] Reference

Eight stumpy legs on either side of its underbelly tilting forward to move it in a smooth undulation.    From Wordnik.com.  [The Dreaming Void]

Are the spectators so bored that they must entertain themselves with displays of rhythmic undulation?.    From Wordnik.com.  [Roger I. Abrams: Kill the Wave] Reference

Lalji closed his eyes and listened to the gentle undulation of the river, the sounds of the distant village.    From Wordnik.com.  [The Year's Best Science Fiction 23rd Annual Collection]

There is a hypnotism of form: a rugged peak will alarm the mind where a billowy green undulation will lull it.    From Wordnik.com.  [Highways & Byways in Sussex] Reference

Once again, he sees history as a process of change, of undulation, not something that has teleological meaning.    From Wordnik.com.  [Shakespeare]

They were the most unlikely of dance partners, and their fiery energy permeated every undulation of their bodies.    From Wordnik.com.  [DVD's, Videos, TiVo, Downloadables] Reference

The mountain summits were glittering in the morning air, every undulation and the face of every hill clear and distinct.    From Wordnik.com.  [Story-Lives of Great Musicians] Reference

These can never straighten out; as soon as one subsides, another must rise, and this happens in a progressive undulation.    From Wordnik.com.  [The Source of Magic]

New characters appear on definite parts of the body, spreading especially from the rear to the front, (the law of undulation).    From Wordnik.com.  [At the Deathbed of Darwinism A Series of Papers] Reference

The luminous undulation and the sound-wave must both produce transmutation of the cerebral Energy in order to affect Consciousness.    From Wordnik.com.  [Essays Towards a Theory of Knowledge] Reference

The day fell calm; a calm evening came; the sea lay in soft, shining undulation, not urgent enough to exasperate the drooping sails.    From Wordnik.com.  [The Atlantic Monthly, Volume 15, No. 87, January, 1865] Reference

We tried several times to lay our course towards the south and clamber up the side of the undulation, but these efforts did not pay us.    From Wordnik.com.  [The South Pole~ Through the Mountains] Reference

Now, this will never become a world full of ballet dancers, because not everyone could learn this graceful undulation if they wanted to.    From Wordnik.com.  [The Art of Stage Dancing The Story of a Beautiful and Profitable Profession] Reference

Just so, it is by the reflection of Light that we discover the forms of the obstacle which solid bodies oppose to the radiant undulation.    From Wordnik.com.  [Essays Towards a Theory of Knowledge] Reference

The undulation, too, instead of dying away gradually from its commencement, runs with equal force, like the line of an S, through the body.    From Wordnik.com.  [Lippincott's Magazine of Popular Literature and Science Volume 12, No. 31, October, 1873] Reference

On the west, in the direction of the nearest land, the undulation rose to such a height that it concealed a great part of the land from us.    From Wordnik.com.  [The South Pole~ The Start for the Pole] Reference

But speech has not only its natural rhythm of stress-undulation and thought-pulsations; it has also, as we saw in the last chapter, a melody.    From Wordnik.com.  [The Principles of Aesthetics] Reference

She walked with indescribable, unconscious grace; with that supple, elastic undulation which would have been coquettish had it not been undeniably natural.    From Wordnik.com.  [The French Immortals Series — Complete] Reference

The country through which we travelled appeared dreary in the extreme: its level, sandy surface being nowhere varied by the pleasing undulation of hill and dale.    From Wordnik.com.  [A Yacht Voyage to Norway, Denmark, and Sweden 2nd edition] Reference

Some of the older girls were beautiful in face as well as graceful in figure, but there was a snaky undulation about their movements which I never saw among Europeans.    From Wordnik.com.  [The Hawaiian Archipelago] Reference

She topped an undulation that was some little distance from the tents with misgivings, and wrapped the reins round her hands to prevent them slipping through her fingers.    From Wordnik.com.  [The Sheik] Reference

The character of the undulation of the whole line determines the type of the rhythm, which may be very different in the case of lines of precisely the same kind of "feet.".    From Wordnik.com.  [The Principles of Aesthetics] Reference

The same smooth, even, velvety carpet of grass was spread upon the landscape, covering every undulation of the surface, except where the rocks had frayed themselves through.    From Wordnik.com.  [The Atlantic Monthly, Volume 20, No. 118, August, 1867] Reference

The viewless wind comes roaring out of the black region of the East, it fills the high heaven, it roars on to the uttermost undulation of the atmosphere, and we are a part of it!.    From Wordnik.com.  [The Atlantic Monthly, Volume 13, No. 80, June, 1864] Reference