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Biology Articles, Tutorials & Dictionary Online

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revolution
1. The act of revolving, or turning round on an axis or a center; the motion of a body round a fixed point or line; rotation; as, the revolution of a wheel, of a top, of the earth on its axis, etc.
2. Return to a point before occupied, or to a point relatively the same; a rolling back; return; as, revolution in an ellipse or spiral. That fear comes thundering back, with dreadful revolution, On my defenseless head. ( milton)
3. The space measured by the regular return of a revolving body; the period made by the regular recurrence of a measure of time, or by a succession of similar events. The short revolution of a day.
4. (Science: astronomy) The motion of any body, as a planet or satellite, in a curved line or orbit, until it returns to the same point again, or to a point relatively the same; designated as the annual, anomalistic, nodical, sidereal, or tropical revolution, according as the point of return or completion has a fixed relation to the year, the anomaly, the nodes, the stars, or the tropics; as, the revolution of the earth about the sun; the revolution of the moon about the earth.
The term is sometimes applied in astronomy to the motion of a body, as a planet, about its own axis, but this motion is usually called rotation.
5. (Science: geometry) The motion of a point, line, or surface about a point or line as its center or axis, in such a manner that a moving point generates a curve, a moving line a surface (called a surface of revolution), and a moving surface a solid (called a solid of revolution); as, the revolution of a right-angled triangle about one of its sides generates a cone; the revolution of a semicircle about the diameter generates a sphere.
6. A total or radical change; as, a revolution in one's circumstances or way of living. The ability . . . Of the great philosopher speedily produced a complete revolution throughout the department. (Macaulay)
7. A fundamental change in political organization, or in a government or constitution; the overthrow or renunciation of one government, and the substitution of another, by the governed. The violence of revolutions is generally proportioned to the degree of the maladministration which has produced them. (Macaulay)
When used without qualifying terms, the word is often applied specifically, by way of eminence, to: (a) The english Revolution in 1689, when William of orange and Mary became the reigning sovereigns, in place of James II. (b) The American Revolution, beginning in 1775, by which the English colonies, since known as the united states, secured their independence. (c) The revolution in France in 1789, commonly called the french Revolution, the subsequent revolutions in that country being designated by their dates, as the Revolution of 1830, of 1848, etc.
Origin: F. Revolution, L. Revolutio. See Revolve.

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revolution 1. The act of revolving, or turning round on an axis or a center; the motion of a body round a fixed point or line; rotation; as, the revolution of a wheel, of a top, of the earth on its axis, etc. 2.

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Words nearby rotation

rotary tiller, rotary valve, rotary wing, rotate, rotating, rotation, rotational molding, rotational nystagmus, rotational quantum number, rotation axis, rotation flap

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for rotation

the act of rotating; rotary motion

a regular cycle of events in a set order or sequence

a planned sequence of cropping according to which the crops grown in successive seasons on the same land are varied so as to make a balanced demand on its resources of fertility

1. a circular motion of a configuration about a given point or line, without a change in shape

2. a transformation in which the coordinate axes are rotated by a fixed angle about the origin

3. another name for curl (def. 11) Abbreviation (for sense 4c): rot

1. the spinning motion of a body, such as a planet, about an internal axis Compare revolution (def. 5a)

2. one complete turn in such motion

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for rotation

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for rotation

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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SETTLE AN ARGY-BARGY: TAKE THE WORD OF THE DAY QUIZ! We're sure you'll solve it, for the words from September 28 to October 4, 2020, with élan! What does "avow" mean? rotary tiller, rotary valve, rotary wing, rotate, rotating, rotation, rotational molding, rotational nystagmus, rotational quantum number, rotation axis, rotation flap Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc.

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I had to make the video quick because every time I had a 10 sec or more video it would say file to large.

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The definition of a revolution is the movement of one object around a center or another object. The Earth travels around the Sun, called an orbit, once a year or every 365.25 days. Effects of Earth's revolution is seasons, as the Earth orbits the Sun, the amount of sunlight each location on the planet gets every day changes slightly, causing seasons like summer, winter, and ect.

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Rotation is the action of rotating around an axis or center. The length of time the earth takes to complete one rotation is 24 hours, and since the sun is hitting the Earth causing day while the other side of the Earth is getting night, the Earth rotates affecting the other side getting day instead of night and the other side getting night instead of day.