Abstract Adiabatic availability, a property, is defined as the largest work that can be done by a system in an adiabatic, constant mass and volume process. Adiabatic availability of all systems at any state is larger than or equal to zero. Adiabatic availability of a system in stable equilibrium state is zero. Adiabatic availability of a composite made of a system and a reservoir is the same as the available energy of the system with respect to the given reservoir. Change of adiabatic availability, transfer of adiabatic availability and destruction of adiabatic availability due to irreversibility for few processes have been investigated.