nutation
noun
Forms nutations
- noun (physics) A bobbing motion that accompanies the precession of a spinning rigid body.
- noun A nodding motion (of the head etc.).
- noun (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.
- noun (botany) The circular motion of the tip of a growing shoot.
Etymology
1610s, from Latin nūtātiō (“nodding”), from nūtō (“to nod”). Compare mutation.
Webster’s 1913
- noun The act of nodding.
- noun 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.
Etymology [L. nutatio a nodding, fr. nutare to nod: cf. F. nutation.]
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “nutation”, CC BY-SA 4.0. Details