Adiabatic Definition

ădē-ə-bătĭk, ādī-ə-
adjective
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).

Wiktionary

(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.

Wiktionary
Antonyms:
other
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.
American Heritage Science
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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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