What is the meaning of Gyration?

The act of turning or whirling, especially around a fixed axis or centre; a circular or spiral motion; rotation.

A rotation around an axis which is not the centre of rotational symmetry; an eccentric or off-centre rotation.

One of the whorls of a spiral univalve shell.

The arrangement of convolutions of gyri in the cerebral cortex of the brain.

Source: wiktionary.org