nutation is a Noun
[1] The act of nodding. So from the midmost the nutation spreads, Round and more round, o`er all the sea of heads. Pope.
[2] 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.
[3] 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.
[4] Circumnutation.
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