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1. In physics, a slight irregular motion in which the axis of rotation of a largely axially symmetric object such as a gyroscope or a planet. 2. In sex, an act during intercourse in which gyration by the receiving partner (usually on top) resulting in a slightly irregular circular movement of the penis within an orifice while the depth of penetration remains constant. 3.In molecular biology, to mix a solution by rocking in a slightly irregular manner using a nutator.
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