”foundation-forming absorption”, is an absorption used as a foundation, or starting point, for the higher spiritual powers (abhin~n~a^, q.v.), or for insight (vipassana^, q.v.), leading to the supermundane paths (s. ariya-puggala). The foundation for the former is the 4th absorption; for insight, however, any absorption is suitable. For details, s. samatha-vipassana^. - (App.).
This term is not found in the Sutta Canon, nor apparently in the Abh. Canon, but very often used in the exegetical literature. The idea, however, expressed thereby, is implied in many places of the old sutta texts, e.g., A. IX, 36, where it is shown how the jha^nas, one after the other, may serve as basis, or foundation (as mental object), for vipassana^. In many of the old sutta texts it is also shown how the 4th jha^na forms the foundation for the attainment of the 5 higher spiritual powers (abhin~n~a^).