The word's field
Yoga begins as a word for the yoke. Built on the root yuj, "to join, to harness," it names the physical act of putting draft animals to a chariot before it names anything interior, and that first sense never fully leaves it. To do yoga, in the oldest usage, is to bind two things into a working whole. From this the word radiates in two directions at once. On one side it becomes an abstract noun for the means: a method, a discipline, the technique by which an end is reached. On the other it names the result: the condition of union itself. A single occurrence of yoga can therefore mean the harnessing, the harness, and the state of being harnessed, and the reader must let the surrounding text decide which weight the word carries.
The word's career in the tradition is a long specialization of that root sense toward the interior. In Upanishadic usage yoga is already the yoking of the senses and the mind, the drawing-in of a scattered attention toward a single point — the firm holding of the faculties that the commentarial tradition would systematize into stages of restraint and absorption. The Bhagavad Gītā takes the word and multiplies it: it speaks of the yoga of action, of knowledge, of devotion, and treats yoga almost as a modal term, the disciplined manner in which any path is walked. There the word is repeatedly defined in the act of being used, as evenness of mind, as skill in action, as the severance from union with sorrow. What holds these together is the root: in every register yoga is the binding of something loose into a governed whole, whether a team of horses, the wandering senses, or the self set toward the absolute.
In the corpus
Across the Sanskrit corpus the lemma appears 56 times in 7 works, steeply weighted toward a single text. The Bhagavad Gītā alone carries 46 of the 56 occurrences, more than four-fifths of the total, with the remaining ten spread thinly across the Upanishadic layer: two apiece in the Bṛhadāraṇyaka, Chāndogya, Kaṭha, and Śvetāśvatara Upanishads, and one each in the Praśna and Taittirīya. The shape of that distribution is itself a piece of intellectual history. Yoga is present but not yet central in the older Upanishads, where it is one term among many for the gathering of the faculties; it becomes a governing word only in the Gītā, which makes it the organizing category of the whole teaching.
Because the corpus concentrates so heavily in one work, the meaningful distribution is internal to the Gītā. The surfaces preserved in the record show the lemma moving through its full grammatical range: the locative yoge, the nominative yogaḥ, the accusative yogam, the dative yogāya "for the sake of yoga" — the mark of a word doing heavy structural work, declined into every case as the argument requires. Where the Upanishadic occurrences are isolated points, the Gītā's form a sustained thread, and the citation record walks that thread through its early chapters.
Canonical moments
The record opens on the second chapter of the Bhagavad Gītā, where yoga is first pressed into its technical senses. At Bhagavad Gītā 2.48 the word stands at one of the text's defining formulations — yoga as the steadiness in which one acts without grasping at the fruit of the act, the evenness of mind that holds firm across success and failure alike. The pointer locates the verse that fixes yoga to equanimity rather than to any outward posture. A few verses on, at Bhagavad Gītā 2.50, the lemma surfaces twice in close succession, in the dative and the nominative, where yoga is named as skill in action, the discipline by which work is done well and without bondage. That the record preserves two surfaces at a single locus marks the density with which the word is worked.
At Bhagavad Gītā 2.39 the locative yoge appears as the text turns from the analysis of the self to the discipline of action, dividing the teaching into a path of understanding and a path of practice — the hinge on which the chapter's structure swings. Moving into the fourth chapter, Bhagavad Gītā 4.03 presents yoga as an inheritance transmitted, lost, and now restored, naming not a mental state but a tradition of practice with a history. Read across these loci the lemma shows its span: evenness of mind, skill in action, the hinge between knowledge and practice, and the discipline passed from teacher to student.
The word's world
Yoga sits at the practical pole of its wing, the word for the method by which the other great terms are reached rather than a name for the destination. Its work is done upon the faculties: the yoking it performs is the gathering of manas, the discursive mind, and the steadying of buddhi, the discerning intellect, so that the scattered instrument is brought under a single governance. Where jñāna, knowledge, and karman, action, name the paths, yoga names the disciplined manner of walking any of them, which is why the Gītā can speak of a yoga of each. The end toward which the harnessing tends is the joining of the embodied self, ātman, with brahman, the absolute, and the discipline is inseparable from dharma, the order within which right action is performed.
Across the wings the resonance is one of practice rather than substance. The Pali tradition, sharing the same root soil, cultivates sati, mindfulness — the gathering of attention that yoga names on the Sanskrit side, aimed at the settling of citta, the mind in movement. What sets yoga apart is its yoke at the center: even as the organizing word of an entire teaching, it never stops meaning the act of binding what is loose into a governed whole. It is the one soul-word of its wing that names not a part of the person nor the ground beneath, but the labor by which the person is brought into union — the harness rather than what is harnessed, and the harnessing itself.
Grounding: corpus figures and citations from the live Logoi corpus record (receipt soul-word-journey-v0). Cross-references: manas, buddhi, ātman, brahman, jñāna, citta, sati.