Gȳ-rā'tion, n.

n. [O. It. girazione.] The act of turning or whirling around a fixed center; a circular or spiral motion; motion about an axis; rotation. “The stately and voluminous gyrations of an ascending balloon.” De Quincey.

If a burning coal be nimbly moved round in a circle, with gyrations continually repeated, the whole circle will appear like fire. Newton.

Center of gyration (Mech.), that point in a body rotating round an axis or point of suspension, at which a given force applied would produce the same angular velocity as it would if the whole mass of the body were collected at that point. — Radius of gyration, the distance between the axis of a rotating body and its center of gyration. Rankin.