“Before Buddhism, before yoga, before any '-ism' claimed it, samādhi named a state of concentration so complete that the boundary between observer and observed dissolved.”
Samādhi derives from the Sanskrit prefix sam- (together, completely) plus ā- (toward) plus the root dhā- (to place, to put). The literal meaning is 'to place together completely' — a total gathering of attention into a single point. The word appears in pre-Buddhist texts, including early Upanishads dating to perhaps the 7th century BCE, where it described the culmination of yogic discipline: a state in which the meditator's awareness became so focused that it merged with its object.
In Patañjali's Yoga Sūtras, composed between the 2nd century BCE and the 4th century CE, samādhi is the eighth and final limb of the ashtanga (eight-limbed) yoga path. Patañjali distinguished between samprajñāta samādhi (absorption with cognitive content) and asamprajñāta samādhi (absorption without any content at all — pure awareness aware of itself). The taxonomy was precise, clinical, and remarkably modern in its attempt to map altered states of consciousness with philosophical rigor.
The Buddha adopted samādhi as a central element of his own path, making it the last factor of the Noble Eightfold Path as sammā samādhi (right concentration). In the Pali Canon, he described four levels of jhāna — meditative absorption — each representing a deeper stage of samādhi. The first jhāna retains thought and evaluation; the fourth jhāna is equanimity so complete that even pleasure and pain have ceased. The Buddhist version of samādhi was not an end in itself but a tool: the concentrated mind was the instrument needed to see reality clearly.
Samādhi traveled through Asia with both Hindu and Buddhist traditions, adapting to each culture's contemplative technology. In Tibetan Buddhism, it became ting nge 'dzin. In Chinese, it was transliterated as sānmèi (三昧) and also translated as dìng (定, 'stillness'). The Japanese pronunciation sanmai entered common speech — the phrase sanmai ni naru means to become completely absorbed in something, whether meditation or a good novel. The word that once named the pinnacle of yogic achievement now describes any state of total immersion.
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Mihaly Csikszentmihalyi's concept of 'flow' — a state of total absorption where self-consciousness disappears and performance peaks — is samādhi translated into the language of psychology. The parallel is not accidental. Csikszentmihalyi studied artists, athletes, and surgeons; Patañjali studied yogis. They found the same phenomenon: when attention narrows to a single point, the self drops away, and what remains is more capable, not less.
"When the mind becomes still, the self rests in its own nature. This is yoga." — Patañjali, Yoga Sūtras 1.3, circa 2nd century BCE
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