Siddhl, Sanskrit, “attainment,” is a term related to Theosophy and other related Hindu traditions meaning a supernormal power resulting from the systematic practice of spiritual disciplines. Theosophy like other disciplines has discouraged the striving for siddhl for its own sake, pointing out such a pursuit distracts from the adherent’s true spiritual betterment. Siddhl attainment alone can promote an inflated ego. A.G.H.
Greer, John Michael. The New Encyclopedia of the Occult. St. Paul, MN, Llewellyn Worldwide. p. 438