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Definition of: adiabatic
(ad′ē·ə·bat′ik, a′dē·ə-) adjective Physics.
Pertaining to a closed thermodynamic system in which changes are effected without gain or loss of heat, as in the insulated cylinder of an engine. [<Gk. adiabatos impassable < a- not + dia- through + bainein go]
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