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countable and uncountable, plural mediumships
(parapsychology) The state of being a medium (psychic conduit); purported ability to mediate communication between spirits of the dead and living human beings. quotations
The mother is a spiritualist—has been for years—and, being on the lookout for it, naturally discovered what she calls 'mediumship' in Viola when a child.
1905, Hamlin Garland, “Dr. Britt Explains”, in Tyranny of the Dark, Reprint edition (Fiction), Project Gutenberg, published 2008, page 70
"I may add that in my own domestic circle, under my wife's mediumship, we have been privileged to bring hope and knowledge to some of these unhappy beings."
1925 July – 1926 May, A[rthur] Conan Doyle, “(please specify the chapter number)”, in The Land of Mist (eBook no. 0601351h.html), Australia: Project Gutenberg Australia, published April 2019
But for myself I do not regard mediumship very favourably.
1936, Rollo Ahmed, The Black Art, London: Long, page 276