Definition of adiabaticity in English:
adiabaticity
noun eɪˌdʌɪəbəˈtɪsɪtiˌadɪəbəˈtɪsɪti
Physics The condition of being adiabatic; the degree to which a process, condition, etc., is adiabatic.
Origin
Late 19th century. From adiabatic + -ity; compare -icity.