adiabatic

adj.
Of, relating to, or being a reversible thermodynamic process that occurs without gain or loss of heat and without a change in entropy.

[From Greek adiabatos, impassable : a-, not; see a-¹ + diabatos, passable (dia-, dia- + batos, passable , from bainein, to go).]

adiabatically ad'i·a·bat'i·cal·ly adv.

Occurring without the gain or loss of heat.

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The adjective has one meaning:

Meaning #1: (physics) occurring without loss or gain of heat
  Antonym: diabatic (meaning #1)

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