Adiabatic absorption refers to a process where heat is transferred between two substances without any exchange of heat with the surroundings. Some of the synonyms for adiabatic absorption include adiabatic cooling, isothermal expansion, and adiabatic process. Adiabatic cooling is the process of cooling a substance without any change in heat when it expands. Similarly, isothermal expansion refers to a process where there is no change in the temperature of the gas during its expansion. Adiabatic process, on the other hand, refers to any thermodynamic process in which the system exchanges no heat with its surroundings. Overall, these terms essentially relate to the same concept, explaining heat transfer between substances while isolating them from the environment.