Etymology
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nutation (n.)

1610s, "action of nodding," from Latin nutationem (nominative nutatio), noun of action from past participle stem of nutare "to nod," from PIE *neu- (2) "to nod" (see numinous). Astronomical use in reference to slight periodical oscillation of the earth's axis is from 1715. Related: Nutational.

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Definitions of nutation

nutation (n.)
uncontrolled nodding;
From wordnet.princeton.edu