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Revolution

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 [[single 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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Re: human dietry evolution since the agricultural revolution?

Why would he think that humans are exempt from evolution? An example of dietary evolution is persistance of lactase production in dairy-use populations.

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by Darby
Sun Jan 25, 2015 10:36 pm
 
Forum: Evolution
Topic: human dietry evolution since the agricultural revolution?
Replies: 2
Views: 879

human dietry evolution since the agricultural revolution?

I was discussing with a colleague a diet he is doing called the Paleo diet, which is based on eating the stuff that our hunter gatherer ancestors would have available (meat, and fruit mainly) on the assumption that this is the diet we evolved to eat, and so is therefore better. I argued that wheat a...

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by hamlet101
Mon Jan 19, 2015 1:47 pm
 
Forum: Evolution
Topic: human dietry evolution since the agricultural revolution?
Replies: 2
Views: 879

Re:

Not entirely - "edge of a revolution in evolution" is pretty lame. "Ability to redesign genes" is pretty immaterial in an evolutionary sense. At best it'll be a boutique operation for the wealthy in developed world. It ...

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by Rap
Sat May 26, 2012 3:59 pm
 
Forum: Evolution
Topic: Perception and Evolution
Replies: 14
Views: 10931

Perception and Evolution

Not entirely - "edge of a revolution in evolution" is pretty lame. "Ability to redesign genes" is pretty immaterial in an evolutionary sense. At best it'll be a boutique operation for the wealthy in developed world. It ...

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by JorgeLobo
Sat May 26, 2012 2:00 pm
 
Forum: Evolution
Topic: Perception and Evolution
Replies: 14
Views: 10931

Re: Perception and Evolution

... offspring, which in turn will be selected under those different pressures, and the surviving genes may then be different. We are on the edge of a revolution in evolution - learned behavior directly affecting one's own (and others) genetic makeup. Mankind is slowly developing the ability to redesign ...

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by Rap
Fri May 25, 2012 6:25 am
 
Forum: Evolution
Topic: Perception and Evolution
Replies: 14
Views: 10931
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