Changes

==Etymology==

==Etymology==

[[Latin]], axis, axle; akin to [https://nordan.daynal.org/wiki/index.php?title=English#ca._600-1100.09THE_OLD_ENGLISH.2C_OR_ANGLO-SAXON_PERIOD Old English] eax axis, axle, [[Greek]] axōn, Lithuanian ašis, [[Sanskrit]] akṣaḥ

[[Latin]], axis, axle; akin to [https://nordan.daynal.org/wiki/index.php?title=English#ca._600-1100.09THE_OLD_ENGLISH.2C_OR_ANGLO-SAXON_PERIOD Old English] eax axis, axle, [[Greek]] axōn, Lithuanian ašis, [[Sanskrit]] akṣaḥ

*Date: [http://www.wikipedia.org/wiki/14th_Century 14th century]

*Date: [https://www.wikipedia.org/wiki/14th_Century 14th century]

==Definitions==

==Definitions==

*1 a : a straight line about which a body or a geometric figure rotates or may be supposed to rotate b : a straight line with respect to which a body or figure is symmetrical —called also axis of symmetry c : a straight line that bisects at right angles a system of parallel chords of a curve and divides the curve into two symmetrical parts d : one of the reference lines of a coordinate system

*1 a : a straight line about which a body or a geometric figure rotates or may be supposed to rotate b : a straight line with respect to which a body or figure is symmetrical —called also axis of symmetry c : a straight line that bisects at right angles a system of parallel chords of a curve and divides the curve into two symmetrical parts d : one of the reference lines of a coordinate system

*9 : a point or continuum on which something centers <an axis of social power>

*9 : a point or continuum on which something centers <an axis of social power>

==Description==

==Description==

A rotation is a movement of an object in a [[circular]] [[motion]]. A two-dimensional  object rotates around a [[center]] (or point) of rotation. A [http://en.wikipedia.org/wiki/Three-dimensional_space three-dimensional object] rotates around an [[imaginary]] line called an '''axis'''. If the axis of rotation is within the [[body]], the body is said to rotate upon itself, or spin—which implies [[relative]] [[speed]] and perhaps free-movement with [[angular]] [[momentum]]. A circular [[motion]] about an external point, e.g. the [[Earth]] about the [[Sun]], is called an [[orbit]] or more properly an orbital [[revolution]].

A rotation is a movement of an object in a [[circular]] [[motion]]. A two-dimensional  object rotates around a [[center]] (or point) of rotation. A [https://en.wikipedia.org/wiki/Three-dimensional_space three-dimensional object] rotates around an [[imaginary]] line called an '''axis'''. If the axis of rotation is within the [[body]], the body is said to rotate upon itself, or spin—which implies [[relative]] [[speed]] and perhaps free-movement with [[angular]] [[momentum]]. A circular [[motion]] about an external point, e.g. the [[Earth]] about the [[Sun]], is called an [[orbit]] or more properly an orbital [[revolution]].

[[Category: Mathematics]]

[[Category: Mathematics]]