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rotation
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- Rotation - n. - The act of turning, as a wheel or a solid body on its axis, as distinguished from the progressive motion of a revolving round 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.
- Rotation - n. - Any return or succesion in a series.
- Rotation - a. - Pertaining to, or resulting from, rotation; of the nature of, or characterized by, rotation; as, rotational velocity.
- Rotatory - a. - Producing rotation of the plane of polarization; as, the rotatory power of bodies on light. See the Note under polarization.
- Screw - n. - A straight line in space with which a definite linear magnitude termed the pitch is associated (cf. 5th Pitch, 10 (b)). It is used to express the displacement of a rigid body, which may always be made to consist of a rotation about an axis combined with a translation parallel to that axis.
- Rote - v. i. - To go out by rotation or succession; to rotate.
- Rotatory - a. - Going in a circle; following in rotation or succession; as, rotatory assembles.
- Paraboloid - n. - The solid generated by the rotation of a parabola about its axis; any surface of the second order whose sections by planes parallel to a given line are parabolas.
- Gyroscope - n. - A form of the above apparatus, invented by M. Foucault, mounted so delicately as to render visible the rotation of the earth, through the tendency of the rotating wheel to preserve a constant plane of rotation, independently of the earth's motion.
- Cylinder - n. - 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.
- Spin - n. - Velocity of rotation about some specified axis.
- Swivel - a. - A piece, as a ring or hook, attached to another piece by a pin, in such a manner as to permit rotation about the pin as an axis.
- Glissette - n. - The locus described by any point attached to a curve that slips continuously on another fixed curve, the movable curve having no rotation at any instant.
- Trochoid - a. - Admitting of rotation on an axis; -- sometimes applied to a pivot joint like that between the atlas and axis in the vertebral column.
- Whirl - v. t. - A turning with rapidity or velocity; rapid rotation or circumvolution; quick gyration; rapid or confusing motion; as, the whirl of a top; the whirl of a wheel.
- Circumduction - n. - The rotation of a limb round an imaginary axis, so as to describe a concial surface.
- Wabble - v. i. - To move staggeringly or unsteadily from one side to the other; to vacillate; to move the manner of a rotating disk when the axis of rotation is inclined to that of the disk; -- said of a turning or whirling body; as, a top wabbles; a buzz saw wabbles.
- Roll - v. i. - To move, as a curved object may, along a surface by rotation without sliding; to revolve upon an axis; to turn over and over; as, a ball or wheel rolls on the earth; a body rolls on an inclined plane.
- Orientation - n. - The tendency of a revolving body, when suspended in a certain way, to bring the axis of rotation into parallelism with the earth's axis.
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