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WordReference Random House Unabridged Dictionary of American English © 2024nu•ta•tion (no̅o̅ tā′shən, nyo̅o̅-),USA pronunciation n. - an act or instance of nodding one's head, esp. involuntarily or spasmodically.
- Botanyspontaneous movements of plant parts during growth.
- [Astron.]the periodic oscillation observed in the precession of the earth's axis and the precession of the equinoxes.
- Mechanicsthe variation of the inclination of the axis of a gyroscope to the vertical.
- Latin nūtātiōn- (stem of nūtātiō), equivalent. to nūtāt(us) (past participle of nūtāre to nod repeatedly; nū- nod + -tā- frequentative suffix + -tus past participle ending) + -iōn- -ion; compare numen
- 1605–15
Collins Concise English Dictionary © HarperCollins Publishers:: nutation /njuːˈteɪʃən/ n - a periodic variation in the precession of the earth's axis causing the earth's poles to oscillate about their mean position
Also called: circumnutation the spiral growth of a shoot, tendril, or similar plant organ, caused by variation in the growth rate in different parts- the act or an instance of nodding the head
Etymology: 17th Century: from Latin nutātiō, from nūtāre to nod |