from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The act or an instance of nodding the head.
- n. A wobble in a spinning gyroscope or other rotating body.
- n. Astronomy A small periodic motion of the celestial pole of the earth with respect to the pole of the ecliptic.
- n. Botany A slight curving or circular movement in a stem, as of a twining plant, caused by irregular growth rates of different parts.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a bobbing motion that accompanies the precession of a spinning rigid body
- n. a nodding motion (of the head etc.)
- n. any of several irregularities in the precession of the equinoxes caused by varying torque applied to the Earth by the Sun and the Moon
- n. the circular motion of the tip of a growing shoot
from the GNU version of the Collaborative International Dictionary of English
- n. The act of nodding.
- n. A very small libratory motion of the earth's axis, by which its inclination to the plane of the ecliptic is constantly varying by a small amount.
- n. The motion of a flower in following the apparent movement of the sun, from the east in the morning to the west in the evening.
- n. Circumnutation.
from The Century Dictionary and Cyclopedia
- n. A nodding.
- n. In pathology, a constant nodding or involuntary shaking of the head.
- n. In astronomy, a small subordinate gyratory movement of the earth's axis, in virtue of which, if it subsisted alone, the pole would describe among the stars, in a period of about nineteen years, a minute ellipse, having its longer axis directed toward the pole of the ecliptic, and the shorter, of course, at right angles to it.
- n. In botany, same as circumnutation.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. uncontrolled nodding
Latin nūtātiō, nūtātiōn-, from nūtātus, past participle of nūtāre, frequentative of -nuere, to nod.(American Heritage® Dictionary of the English Language, Fourth Edition)
First attested in 1610s. Derived from Latin nutatio, from nūtō ("I nod"). (Wiktionary)