Adiabatic Definition

ădē-ə-bătĭk, ādī-ə-
Of, relating to, or being a reversible thermodynamic process that occurs without gain or loss of heat and without a change in entropy.
American Heritage
Of a process that occurs without loss or gain of heat.
Webster's New World

(physics, thermodynamics, of a process) That occurs without gain or loss of heat (thus with no change in entropy, in the quasistatic approximation).


(physics, quantum mechanics, of a process) That involves the slow change of the Hamiltonian of a system from its initial value to a final value.


Origin of Adiabatic

  • From Greek adiabatos impassable a- not a–1 diabatos passable (dia- dia-) (batos passable) (from bainein to go gwā- in Indo-European roots)

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Ancient Greek ἀδιάβατος (adiabatos, “impassible”), from (a, “not”) + διά (dia, “through”) + βατός (batos, “passable”), from βαίνειν (bainein, “to go”). See βαίνω (bainō).

    From Wiktionary

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