nutations

/N UW1 T EY1 SH AH0 N Z/

noun

1
(astronomy) Any of several irregularities in the precession of the equinoxes caused by varying torque applied to the Earth by the Sun and the Moon.
2
(physics) A bobbing motion that accompanies the precession of a spinning rigid body.
3
A nodding motion (of the head etc.).
4
(botany) The circular motion of the tip of a growing shoot.

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