(In various forms of mysticism) a realm of immaterial existence, especially one posited as an ethereal or eternal counterpart to physical or bodily reality; (Theosophy) the plane of existence immediately beyond the physical.
Origin
Late 19th century.
Definition of astral plane in US English:
astral plane
noun
(In various forms of mysticism) a realm of immaterial existence, especially one posited as an ethereal or eternal counterpart to physical or bodily reality; (Theosophy) the plane of existence immediately beyond the physical.