Causal plane
Causal plane is a term used in Neo-Theosophy, some contemporary Vedanta, the New Age, (especially some channelled communications), and sometimes Occultism, to describe a high spiritual plane of existence, i.e. (hyperplane, which even the physical is). However there is great variation between the different definitions.
Neo-theosophy
The Neo-theosophy of Annie Besant and C. W. Leadbeater replaced Blavatsky's "Higher Manas" principle with the "Higher Mental", "Abstract Mind" (as opposed to Lower Mental or "Concrete Mind"), or Causal Body. The equivalent cosmic plane is the Causal Plane. A detailed description of the Causal Plane, along with the Causal Body, is provided by A. E. Powell, who has compiled information in the works of Besant and Leadbeater in a series of books on each of the subtle bodies.
The Neo-theosphical concept of Causal Plane proved very influential both in India (via the Adyar branch of Theosophy) and in the New Age, via Alice Bailey.
Contemporary Hinduism
Satguru Sivaya Subramuniyaswami incorporates Theosophical ideas into the traditional Hindu Vedic cosmology, when he describes three worlds of existence (triloka) as Bhuloka or physical plane, Antarloka or the subtle or astral plane, and Sivaloka ("World of Siva") or the causal plane or Karanaloka, the world of the Gods and highly developed souls. About this latter he says