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erg
erg , unit of work or energy in the cgs system of units, which is based on the metric system ; it is the work done or energy expended by a force of 1 dyne acting through a distance of 1 centimeter. In terms of the joule , the unit of work or energy in the mks system, 1 erg equals 0.0000001 j...
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centimeter
centimeter , abbr. cm, unit of length equal to 0.01 meter , the basic unit of length in the metric system . The centimeter is the unit of length in the cgs system . It is approximately equal to 0.39 inch, or 1 inch equals about 2.54 centimeters. See weights and measures .
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cybernetics
cybernetics [Gr.,=steersman], term coined by American mathematician Norbert Wiener to refer to the general analysis of control systems and communication systems in living organisms and machines. In cybernetics, analogies are drawn between the functioning of the brain and nervous system and th...
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hectare
hectare , abbr. ha, unit of area in the metric system , equal to 10,000 sq m, or about 2.47 acres.
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dyne
dyne , unit of force in the cgs system of units, which is based on the metric system ; an acceleration of 1 centimeter per second per second is produced when a force of 1 dyne is exerted on a mass of 1 gram. In terms of the newton , the force unit in the mks system , 1 dyne equals 0.00001 new...
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temperament
temperament in music, the altering of certain intervals from their acoustically correct values to provide a system of tuning whereby music can move from key to key without unacceptably impure sonorities. It is particularly necessary for keyboard instruments, the pitches of which cannot be varied in...
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gram
gram abbr. g, unit of mass equal to 0.001 kilogram , the basic unit of mass in the metric system . The gram is the unit of mass in the cgs system . It is approximately equal to 0.035 avoirdupois ounce, or 0.0022 pound; a 1-pound mass equals about 453.6 grams.
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civil engineering
civil engineering Field of engineering dealing with large structures and systems. Civil engineers provide facilities for living, industry and transportation, such as roads, bridges, airports, dams, harbours and tunnels....
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relativity
relativity physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. One consequence of the theory is that space and time are no longer viewed as separate, independent entities but...
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charge
charge property of matter that gives rise to all electrical phenomena (see electricity ). The basic unit of charge, usually denoted by e, is that on the proton or the electron ; that on the proton is designated as positive (+ e ) and that on the electron is designated as negative (- e ). All ...
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