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nd another body or a distant point; thus, the daily turning of the earth on its axis is a rotation; its annual motion round the sun is a revolution.

The act of rolling or revolving round, as a wheel; circumvolution; the state of being whirled round. J. Gregory.

Circular motion in a direction contrary to some other circular motion.

Not rotatory; passing from one point to another by a movement other than rotation; -- said of the movement of parts of a liquid or yielding mass. Sir W. Thomson.

Rotation in the direction of an outgoing right-handed screw; counter-clockwise rotation; -- applied chiefly to the turning of the plane of polarization of light.

A usage, among diplomats, of rotation in precedence among representatives of equal rank, sometimes determined by lot and at other times in regular order. The practice obtains in the signing of treaties and conventions between nations.

Aside; off; in another direction. The axis of rotation is inclined away from the sun. Lockyer.

crop grown between the rows of another crop or intermediate between two crops in ordinary rotation in point of time. -- Catch"- crop`ping, n.

, a process invented for the purpose of measuring the area or the volume generated by the rotation of a line or surface about a fixed axis, depending upon the principle that every figure formed by the revolution of a line or surface about such an axis has for measure the product of the line or surface by the length of…

The rotation of a limb round an imaginary axis, so as to describe a concial surface.

Like the motion of the hands of a clock; -- said of that direction of a rotation about an axis, or about a point in a plane, which is ordinarily reckoned negative.

Two rotations, movements, etc., which are equal in amount but opposite in direction, and acting along parallel lines or around parallel axes.

A machine for measuring at any moment velocity of rotation, as of a wheel of a steam engine. Knight.

A solid body which may be generated by the rotation of a parallelogram round one its sides; or a body of rollerlike form, of which the longitudinal section is oblong, and the cross section is circular.

electric wave, a process usually accomplished by some method of tapping or shaking, or by rotation of the coherer.

tly vertical line of descent which occurs in a body falling freely, in consequence of the rotation of the earth. -- Deviation of the compass, the angle which the needle of a ship's compass makes with the magnetic meridian by reason of the magnetism of the iron parts of the ship. -- Deviation of the line of the vertic…

An apparatus for distributing an electric current, either to various points in rotation, as in some motors, or along two or more lines in parallel, as in a distributing system.

iurnal aberration (Anat.), the aberration of light arising from the effect of the earth's rotation upon the apparent direction of motion of light. -- Diurnal arc, the arc described by the sun during the daytime or while above the horizon; hence, the arc described by the moon or a star from rising to setting. -- Diurn…

he steam engine. (b) A cogwheel set to turn about an eccentric axis used to give variable rotation. -- Eccentric hook or gab, a hook-shaped journal box on the end of an eccentric rod, opposite the strap. -- Eccentric rod, the rod that connects as eccentric strap with any part to be acted upon by the eccentric. -- Ec…

Having wheels of the same size or diameter; having equal rotation. [R.]