[ad-ee-uh-bat-ik, ey-dahy-uh-]
occurring without gain or loss of heat (opposed to diabatic ): an adiabatic process.

1875–80; < Greek adiábat(os) incapable of being crossed (a- a-6 + dia- dia- + ba- (stem of baínein to cross) + -tos verbal adjective suffix) + -ic; cf. diabatic

adiabatically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adiabatic (ˌædɪəˈbætɪk, ˌeɪ-)
1.  (of a thermodynamic process) taking place without loss or gain of heat
2.  a curve or surface on a graph representing the changes in two or more characteristics (such as pressure and volume) of a system undergoing an adiabatic process
[C19: from Greek adiabatos not to be crossed, impassable (to heat), from a-1 + diabatos passable, from dia- across + bainein to go]

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American Heritage
Science Dictionary
adiabatic   (ād'ē-ə-bāt'ĭk)  Pronunciation Key 
Occurring without gain or loss of heat. When a gas is compressed under adiabatic conditions, its pressure increases and its temperature rises without the gain or loss of any heat. Conversely, when a gas expands under adiabatic conditions, its pressure and temperature both decrease without the gain or loss of heat. The adiabatic cooling of air as it rises in the atmosphere is the main cause of cloud formation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The big question, he says, is whether the adiabatic method's gradual adjustment
  of qubits would operate rapidly at that size.
Adiabatic process is described in all thermodynamics textbooks.
The company's approach to computing, known as adiabatic quantum computing, has
  been heavily criticised.
Adiabatic lapse rate simply explains the distribution of temperatures within an
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