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The surface of constant negative curvature generated by the revolution of a tractrix. This surface corresponds in non-Euclidian space to the sphere in ordinary space. An important property of the surface is that any figure drawn upon it can be displaced in any way without tearing it or altering in size any of its eleme…

Backward tendency or movement after revolution, reform, or great progress in any direction. The new king had, at the very moment at which his fame and fortune reached the highest point, predicted the coming reaction. Macaulay. Reaction time (Physiol.), in nerve physiology, the interval between the application of a stim…

One who favors reaction, or seeks to undo political progress or revolution.

t., one who has been reconcentrated; specif., in Cuba, the Philippines, etc., during the revolution of 1895-98, one of the rural noncombatants who were concentrated by the military authorities in areas surrounding the fortified towns, and later were reconcentrated in the smaller limits of the towns themselves.…

villages for convenience in political or military administration, as in Cuba during the revolution of 1895-98.

om the modern; especially, the political and social system existing in France before the Revolution of 1789.

r resting; unquiet; uneasy; continually moving; as, a restless child. Chaucer. "Restless revolution day by day." Milton.

s in the illustration. -- To reverse an engine or a machine, to cause it to perform its revolutions or action in the opposite direction.

The act or state of revolving; revolution. [Archaic] Its own revolvency upholds the world. Cowper.

Making a revolution or revolutions; rotating; -- used also figuratively of time, seasons, etc., depending on the revolution of the earth. But grief returns with the revolving year. Shelley. Revolving seasons, fruitless as they pass. Cowper. Revolving firearm. See Revolver. -- Revolving light, a light or lamp in a ligh…

The solid generated by the revolution of a circle, or other figure, about an exterior straight line (as an axis) lying in the same plane as the circle or other figure.

To perform a periodical revolution; to move onward as with a revolution; as, the rolling year; ages roll away.

ily turning of the earth on its axis is a rotation; its annual motion round the sun is a revolution.

where it began; a series of like events recurring in continuance; a cycle; a periodical revolution; as, the round of the seasons; a round of pleasures.

Leaping or dancing; having the power of, or used in, leaping or dancing. Saltatory evolution (Biol.), a theory of evolution which holds that the transmutation of species is not always gradual, but that there may come sudden and marked variations. See Saltation. -- Saltatory spasm (Med.), an affection in which pressure…

ellow without breeches; a ragged fellow; -- a name of reproach given in the first French revolution to the extreme republican party, who rejected breeches as an emblem peculiar to the upper classes or aristocracy, and adopted pantaloons.

pertaining to, or involving, sans-culottism; radical; revolutionary; Jacobinical. Carlyle.

m the sun nearly eight hundred and eighty millions of miles, and its year, or periodical revolution round the sun, nearly twenty-nine years and a half. It is surrounded by a remarkable system of rings, and has eight satellites.

ufficient to support and demonstrate a whole scheme of moral philosophy. J. Edwards. The Revolution came and changed his whole scheme of life. Macaulay.

of the horizon. -- Sector of a sphere, or Spherical sector, the solid generated by the revolution of the sector of a circle about one of its radii, or, more rarely, about any straight line drawn in the plane of the sector through its vertex.