In a general sense, samādhi can describe a number of different meditative states. In the Mahāyāna literature, in particular in the Prajñāpāramitā sūtras, we find extensive lists of different samādhis, numbering over one hundred.

In a more restricted sense, and when understood as a mental state, samādhi is defined as the one-pointedness of the mind (cittaikāgratā), the ability to remain on the same object over long periods of time. The Drajor Bamponyipa (sgra sbyor bam po gnyis pa) commentary on the Mahāvyutpatti explains the term samādhi as referring to the instrument through which mind and mental states “get collected,” i.e., it is by the force of samādhi that the continuum of mind and mental states becomes collected on a single point of reference without getting distracted.

The essentially pure nature of mind is obscured and afflicted by various psychological defilements, which destroy the mind’s peace and composure and lead to unwholesome deeds of body, speech, and mind, acting as causes for continued existence in saṃsāra. Included among them are the primary afflictions of desire (rāga), anger (dveṣa), and ignorance (moha). It is said that there are eighty-four thousand of these negative mental qualities, for which the eighty-four thousand categories of the Buddha’s teachings serve as the antidote.

Kleśa is also commonly translated as “negative emotions,” “disturbing emotions,” and so on. The Pāli kilesa, Middle Indic kileśa, and Buddhist Hybrid Sanskrit kleśa all primarily mean “stain” or “defilement.” The translation “affliction” is a secondary development that derives from the more general (non-Buddhist) classical understanding of √kliś (“to harm,“ “to afflict”). Both meanings are noted by Buddhist commentators.

A type of nonhuman being whose precise status is subject to different views, but is included as one of the six classes of beings in the sixfold classification of realms of rebirth. In the Buddhist context, asuras are powerful beings said to be dominated by envy, ambition, and hostility. They are also known in the pre-Buddhist and pre-Vedic mythologies of India and Iran, and feature prominently in Vedic and post-Vedic Brahmanical mythology, as well as in the Buddhist tradition. In these traditions, asuras are often described as being engaged in interminable conflict with the devas (gods).

The term dharma conveys ten different meanings, according to Vasubandhu’s Vyākhyā­yukti. The primary meanings are as follows: the doctrine taught by the Buddha (Dharma); the ultimate reality underlying and expressed through the Buddha’s teaching (Dharma); the trainings that the Buddha’s teaching stipulates (dharmas); the various awakened qualities or attainments acquired through practicing and realizing the Buddha’s teaching (dharmas); qualities or aspects more generally, i.e., phenomena or phenomenal attributes (dharmas); and mental objects (dharmas).

Yeshé Dé (late eighth to early ninth century) was the most prolific translator of sūtras into Tibetan. Altogether he is credited with the translation of more than one hundred sixty sūtra translations and more than one hundred additional translations, mostly on tantric topics. In spite of Yeshé Dé’s great importance for the propagation of Buddhism in Tibet during the imperial era, only a few biographical details about this figure are known. Later sources describe him as a student of the Indian teacher Padmasambhava, and he is also credited with teaching both sūtra and tantra widely to students of his own. He was also known as Nanam Yeshé Dé, from the Nanam (sna nam) clan.

In Buddhist literature, this is an epithet applied to buddhas, most often to Śākyamuni. The Sanskrit term generally means “possessing fortune,” but in specifically Buddhist contexts it implies that a buddha is in possession of six auspicious qualities (bhaga) associated with complete awakening. The Tibetan term‍—where bcom is said to refer to “subduing” the four māras, ldan to “possessing” the great qualities of buddhahood, and ’das to “going beyond” saṃsāra and nirvāṇa‍—possibly reflects the commentarial tradition where the Sanskrit bhagavat is interpreted, in addition, as “one who destroys the four māras.” This is achieved either by reading bhagavat as bhagnavat (“one who broke”), or by tracing the word bhaga to the root √bhañj (“to break”).

Dhyāna is defined as one-pointed abiding in an undistracted state of mind, free from afflicted mental states. Four states of dhyāna are identified as being conducive to birth within the form realm. In the context of the Mahāyāna, it is the fifth of the six perfections. It is commonly translated as “concentration,” “meditative concentration,” and so on.

A term meaning defilement, impurity, and pollution, broadly referring to cognitive and emotional factors that disturb and obscure the mind. As the self-perpetuating process of affliction in the minds of beings, it is a synonym for saṃsāra. It is often paired with its opposite, vyavadāna, meaning “purification.”

Morally virtuous or disciplined conduct and the abandonment of morally undisciplined conduct of body, speech, and mind. In a general sense, moral discipline is the cause for rebirth in higher, more favorable states, but it is also foundational to Buddhist practice as one of the three trainings (triśikṣā) and one of the six perfections of a bodhisattva. Often rendered as “ethics,” “discipline,” and “morality.”

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.

Refers to the five fundamental precepts of abstaining from killing, stealing, sexual misconduct, lying, and consuming intoxicants.

A class of generally benevolent nonhuman beings who inhabit the skies, sometimes said to inhabit fantastic cities in the clouds, and more specifically to dwell on the eastern slopes of Mount Meru, where they are ruled by the Great King Dhṛtarāṣṭra. They are most renowned as celestial musicians who serve the gods. In the Abhidharma, the term is also used to refer to the mental body assumed by sentient beings during the intermediate state between death and rebirth. Gandharvas are said to live on fragrances (gandha) in the desire realm, hence the Tibetan translation dri za, meaning “scent eater.”

The Sanskrit pravrajyā literally means “going forth,” with the sense of leaving the life of a householder and embracing the life of a renunciant. When the term is applied more technically, it refers to the act of becoming a male novice (śrāmaṇera; dge tshul) or female novice (śrāmaṇerikā; dge tshul ma), this being a first stage leading to full ordination.

In the most general sense the devas‍—the term is cognate with the English divine‍—are a class of celestial beings who frequently appear in Buddhist texts, often at the head of the assemblies of nonhuman beings who attend and celebrate the teachings of the Buddha Śākyamuni and other buddhas and bodhisattvas. In Buddhist cosmology the devas occupy the highest of the five or six “destinies” (gati) of saṃsāra among which beings take rebirth. The devas reside in the devalokas, “heavens” that traditionally number between twenty-six and twenty-eight and are divided between the desire realm (kāmadhātu), form realm (rūpadhātu), and formless realm (ārūpyadhātu). A being attains rebirth among the devas either through meritorious deeds (in the desire realm) or the attainment of subtle meditative states (in the form and formless realms). While rebirth among the devas is considered favorable, it is ultimately a transitory state from which beings will fall when the conditions that lead to rebirth there are exhausted. Thus, rebirth in the god realms is regarded as a diversion from the spiritual path.

In Buddhist cosmology, the Heaven of the Thirty-Three is the second lowest of the six heavens in the desire realm (kāmadhātu). Situated on the flat summit of Mount Sumeru, it lies above the Heaven of the Four Great Kings (Caturmahārāja­kāyika) and below the Yāma Heaven. It consists of thirty-three regions, each presided by one of thirty-three chief gods, and the overall ruler is Śakra. The presiding gods are divided into four groups named in the Abhidharma­kośa­ṭīkā (Toh 4092): the eight gods of wealth, two Aśvin youths, eleven fierce ones, and twelve suns. The thirty-three regions themselves are enumerated and described in The Application of Mindfulness of the Sacred Dharma, Toh 287, 4.B.2 et seq.).

One of the first Buddhist monasteries, located in a park outside Śrāvastī, the capital of the ancient kingdom of Kośala in northern India. This park was originally owned by Prince Jeta, hence the name Jetavana, meaning Jeta’s grove. The wealthy merchant Anāthapiṇḍada, wishing to offer it to the Buddha, sought to buy it from him, but the prince, not wishing to sell, said he would only do so if Anāthapiṇḍada covered the entire property with gold coins. Anāthapiṇḍada agreed, and managed to cover all of the park except the entrance, hence the name Anāthapiṇḍadasyārāmaḥ, meaning Anāthapiṇḍada’s park. The place is usually referred to in the sūtras as “Jetavana, Anāthapiṇḍada’s park,” and according to the Saṃghabhedavastu the Buddha used Prince Jeta’s name in first place because that was Prince Jeta’s own unspoken wish while Anāthapiṇḍada was offering the park. Inspired by the occasion and the Buddha’s use of his name, Prince Jeta then offered the rest of the property and had an entrance gate built. The Buddha specifically instructed those who recite the sūtras to use Prince Jeta’s name in first place to commemorate the mutual effort of both benefactors.

Anāthapiṇḍada built residences for the monks, to house them during the monsoon season, thus creating the first Buddhist monastery. It was one of the Buddha’s main residences, where he spent around nineteen rainy season retreats, and it was therefore the setting for many of the Buddha’s discourses and events. According to the travel accounts of Chinese monks, it was still in use as a Buddhist monastery in the early fifth century ᴄᴇ, but by the sixth century it had been reduced to ruins.

In its most general sense, this term refers to the state of freedom from suffering and cyclic existence, or saṃsāra, that is the goal of the Buddhist path. More specifically, the term may refer to a category of advanced meditative attainment such as those of the “eight liberations.”

One of the principal śrāvaka disciples of the Buddha, paired with Śāriputra. He was renowned for his miraculous powers. His family clan was descended from Mudgala, hence his name Maudgalyā­yana, “the son of Mudgala’s descendants.” Respectfully referred to as Mahā­maudgalyā­yana, “Great Maudgalyāyana.”

The supernatural powers of a śrāvaka correspond to the first abhijñā: “Being one he becomes many, being many he becomes one; he becomes visible, invisible; goes through walls, ramparts and mountains without being impeded, just as through air; he immerses himself in the earth and emerges from it as if in water; he goes on water without breaking through it, as if on [solid] earth; he travels through the air crosslegged like a winged bird; he takes in his hands and touches the moon and the sun, those two wonderful, mighty beings, and with his body he extends his power as far as the Brahma world” (Śūraṃgamasamādhisūtra, trans. Lamotte 2003).

The great supernatural powers (maharddhi) of bodhisattvas are “causing trembling, blazing, illuminating, rendering invisible, transforming, coming and going across obstacles, reducing or enlarging worlds, inserting any matter into one’s own body, assuming the aspects of those one frequents, appearing and disappearing, submitting everyone to one’s will, dominating the supernormal power of others, giving intellectual clarity to those who lack it, giving mindfulness, bestowing happiness, and finally, emitting beneficial rays” (Śūraṃgamasamādhisūtra, trans. Lamotte 2003).

According to ancient Buddhist cosmology, this is the great mountain forming the axis of the universe. At its summit is Sudarśana, home of Śakra and his thirty-two gods, and on its flanks live the asuras. The mount has four sides facing the cardinal directions, each of which is made of a different precious stone. Surrounding it are several mountain ranges and the great ocean where the four principal island continents lie: in the south, Jambudvīpa (our world); in the west, Godānīya; in the north, Uttarakuru; and in the east, Pūrvavideha. Above it are the abodes of the desire realm gods. It is variously referred to as Meru, Mount Meru, Sumeru, and Mount Sumeru.

A class of nonhuman beings who live in subterranean aquatic environments, where they guard wealth and sometimes also teachings. Nāgas are associated with serpents and have a snakelike appearance. In Buddhist art and in written accounts, they are regularly portrayed as half human and half snake, and they are also said to have the ability to change into human form. Some nāgas are Dharma protectors, but they can also bring retribution if they are disturbed. They may likewise fight one another, wage war, and destroy the lands of others by causing lightning, hail, and flooding.

The sixth of the six perfections, it refers to the profound understanding of the emptiness of all phenomena, the realization of ultimate reality. It is often personified as a female deity, worshiped as the “Mother of All Buddhas” (sarva­jina­mātā).

Literally, “buddha for oneself” or “solitary realizer.” Someone who, in his or her last life, attains awakening entirely through their own contemplation, without relying on a teacher. Unlike the awakening of a fully realized buddha (samyaksambuddha), the accomplishment of a pratyeka­buddha is not regarded as final or ultimate. They attain realization of the nature of dependent origination, the selflessness of the person, and a partial realization of the selflessness of phenomena, by observing the suchness of all that arises through interdependence. This is the result of progress in previous lives but, unlike a buddha, they do not have the necessary merit, compassion or motivation to teach others. They are named as “rhinoceros-like” (khaḍgaviṣāṇakalpa) for their preference for staying in solitude or as “congregators” (vargacārin) when their preference is to stay among peers.

A person’s particular preceptor within the monastic tradition. They must have at least ten years of standing in the saṅgha, and their role is to confer ordination, to tend to the student, and to provide all the necessary requisites, therefore guiding that person for the taking of full vows and the maintenance of conduct and practice. This office was decreed by the Buddha so that aspirants would not have to receive ordination from the Buddha in person, and the Buddha identified two types: those who grant entry into the renunciate order and those who grant full ordination. The Tibetan translation mkhan po has also come to mean “a learned scholar,” the equivalent of a paṇḍita, but that is not the intended meaning in Indic Buddhist literature.

Brahman is a Sanskrit term referring to what is highest (parama) and most important (pradhāna); the Nibandhana commentary explains brahman as meaning here nirvāṇa, and thus the brahman conduct is the “conduct toward brahman,” the conduct that leads to the highest liberation, i.e., nirvāṇa. This is explained as “the path without outflows,” which is the “truth of the path” among the four truths of the noble ones. Other explanations (found in the Pāli tradition) take “brahman conduct” to mean the “best conduct,” and also the “conduct of the best,” i.e., the buddhas. In some contexts, “brahman conduct” refers more specifically to celibacy, but the specific referents of this expression are many.

The land of the dead ruled over by the Lord of Death. In Buddhism it refers to the preta realm, where beings generally suffer from hunger and thirst, which in traditional Brahmanism is the fate of those departed without descendants to make ancestral offerings.