the term ‘buddha-body’ refers not only to the physical body of a buddha, but also to the varying ‘dimensions’ in which the embodiment of fully enlightened attributes is present
This passage provides the canonical Tibetan scholastic definition of Buddha Body, articulating it as a multi-dimensional framework of enlightened embodiment classified differently across Hīnayāna, Mahāyāna, and Vajrayāna levels of teaching.
, The Tibetan Book of the Dead (Penguin Classics), 2005thesis