The term dhāraṇī has the sense of something that “holds” or “retains,” and so it can refer to the special capacity of practitioners to memorize and recall detailed teachings. It can also refer to a verbal expression of the teachings‍—an incantation, spell, or mnemonic formula‍—that distills and “holds” essential points of the Dharma and is used by practitioners to attain mundane and supramundane goals. The same term is also used to denote texts that contain such formulas.

Literally “heart,” this term means the heart essence or essence of the deity and here refers to the deity’s mantra.

A cosmic period of time, sometimes equivalent to the time when a world system appears, exists, and disappears. According to the traditional Abhidharma understanding of cyclical time, a great eon (mahākalpa) is divided into eighty lesser eons. In the course of one great eon, the universe takes form and later disappears. During the first twenty of the lesser eons, the universe is in the process of creation and expansion; during the next twenty it remains; during the third twenty, it is in the process of destruction; and during the last quarter of the cycle, it remains in a state of empty stasis. A fortunate, or good, eon (bhadrakalpa) refers to any eon in which more than one buddha appears.

An epithet for the historical Buddha, Siddhārtha Gautama: he was a muni (“sage”) from the Śākya clan. He is counted as the fourth of the first four buddhas of the present Good Eon, the other three being Krakucchanda, Kanakamuni, and Kāśyapa. He will be followed by Maitreya, the next buddha in this eon.