1. (n.) The act of turning or whirling, as around a fixed center; a circular or spiral motion; motion about an axis; rotation; revolution.

2. (n.) One of the whorls of a spiral univalve shell.

angular momentum angular motion angular velocity axial motion bowling centrifugation circuit circulation circumgyration circumrotation circumvolution full circle gyre pivoting reeling revolution roll rolling rotation rotational motion round spin spinning swinging swirling swiveling trolling trundling turbination turn turning volutation volution wheel wheeling whir whirl whirling