plural of rotational symmetry

(astronomy) The sidereal day of a planet. (I.e., in the definition for "sidereal day", replace "Earth" by the given planet.)

A system of crop rotation in this order: potatoes, oats, peas, rye.

plural of sidereal rotation period

(medicine) rotationplasty

(geometry) A theorem which states that, in 3-dimensional space, any displacement of a rigid body such that some point on it remains fixed is equivalent to a single rotation about some axis that runs through said point.

So as to rotate.