Definition of adiabatic
: occurring without loss or gain of heat <adiabatic expansion of a gas>
adiabaticallyplay \-ti-k(ə-)lē\ adverb
Origin and Etymology of adiabatic
Greek adiabatos impassable, from a- + diabatos passable, from diabainein to go across, from dia- + bainein to go — more at come
First Known Use: 1859
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