The present work, though non-technical in nature, is comprehensive, and apart from dealing with the Tantric terms and concepts pertaining to various forms of religious system, also contains entries on extra-religious contents of Tantrism such as chemical and medical sciences, philosophical speculations especially on metaphysics and epistemology, yoga and physical exercises. Tantric deities are also dealt with -- the hundreds of gods and goddesses who have no independent and real existence apart from the mind of the worshipper and the manner of worship. Tantric texts, with brief details of their contents and publication, are recorded. All the important entries contain textual references which will prove useful to scholars and researchers. The volume also contains a large and updated bibliography and a comprehensive introduction.