Supracosmic space - That part of space, where there exists no other substance such as Dharināstikāya (fundamental substance qua medium of motion) etc., except space.
...ajīvadesamāgāse, aloe se viyāhie...
(U 36.2)
śeṣadravyaśūnyamākāśamalokaḥ.
(Jaisidī 1.13)