Open the Rigveda, composed somewhere between 1500 and 1200 BCE, and the word yoga is already there. It mostly means harnessing horses to a chariot.
Yoking
The root is yuj, to join, to yoke, to harness. It is cognate with the English yoke, and the two words descend from the same Proto-Indo-European source. In its earliest Vedic usage the sense is practical and often military. You yoke animals. You harness a team. You apply force to a task and bind things together so they pull in one direction.
That is the literal floor of the word, and everything the tradition later built stands on it.
Three Things It Came to Mean
The spiritual senses developed over centuries, and they are not identical. Three main readings emerged, and different schools favour different ones.
Union. The joining of the individual self with the universal, atman with brahman. This is the Vedantic reading, and it is the one most commonly given in modern classes and dictionaries.
Discipline. Yoga as a method, a harnessing of the self by the self. The Bhagavad Gita uses the word this way constantly, attaching it to different practices: karma yoga, bhakti yoga, jnana yoga. Here yoga is closer to a discipline than to union.
Stilling. Patanjali’s definition, given in the second sutra of his text. Yogash chitta vritti nirodhah, yoga is the stilling of the fluctuations of the mind.
That third definition sits awkwardly with the first, and the awkwardness is philosophically real rather than a matter of translation.
Where Union and Separation Collide
Patanjali’s system rests on Samkhya metaphysics, which holds that purusha, pure consciousness, and prakriti, everything material and mental, are permanently distinct. The goal in that framework is kaivalya, which means aloneness or isolation. Consciousness recognises that it was never the mechanism it had identified with, and rests in its own nature. That is not union. It is closer to disentanglement.
So the most widely repeated definition of yoga, union with the divine, describes the Vedantic goal accurately and describes Patanjali’s goal poorly. Two of the tradition’s central texts are pointing in different directions, and a great deal of popular writing papers over the gap without noticing it is there.
Honest usage depends on knowing which sense you mean.
The Katha Turn
The moment the word shifts from horses to minds can be located reasonably well. The Katha Upanishad, which most scholars place somewhere in the fifth to fourth century BCE, contains what is generally taken to be the earliest clear use of yoga in its later spiritual sense. It describes yoga as the firm holding steady of the senses, and warns that the state is not permanent. It comes and it goes. The same text supplies the image that anchors everything afterwards.
The body is a chariot. The senses are the horses. The mind is the reins. The intellect is the charioteer. The self is the passenger, who is not driving, who is not the vehicle, and who arrives nowhere at all if the charioteer is careless and the horses run. Notice what has happened. The chariot has not disappeared from the word. It has moved inside.
A Word in Two Registers
A second complication hides inside the translation. The Gita uses yoga as a suffix constantly, attaching it to almost anything. Karma yoga. Bhakti yoga. Jnana yoga. Dhyana yoga. It even titles its first chapter Arjuna Vishada Yoga, usually rendered as the yoga of Arjuna’s despair. Despair is not a spiritual discipline. In that title the word is functioning closer to chapter or topic than to anything technical.
Sanskrit tolerates this range comfortably. English does not, and translators have to choose. That choice is one reason the same passage can look quite different across two editions.
What It Does Not Mean
Two things are worth stating plainly, because both are widely assumed.
Yoga does not mean physical postures. Asana means posture, and it is one of eight limbs in Patanjali’s scheme, occupying three sutras out of 196. A person saying “I do yoga” and meaning “I do asana” is using a part for the whole.
Yoga is not one system. The word covers Patanjali’s eight limbs, the Gita’s paths of action and devotion and knowledge, the tantric and hatha traditions with their energetic anatomy, and the modern postural practice. These share vocabulary and disagree substantially about what a person is and what liberation involves.
Who Is a Yogi
The word for a practitioner has moved as much as the practice. In the earliest usage a yogi is a specific and slightly alarming figure. Someone who has left ordinary life. The Rigveda’s Kesin hymn describes long-haired ascetics, wind-girdled, wearing soiled saffron or nothing. Later texts add wandering, matted hair, cremation ash, and residence at burial grounds.
Medieval Sanskrit literature often treats yogis with open suspicion. They appear in stories as figures with dangerous powers and uncertain motives, and there was a genuine social category of armed ascetic orders in northern India. The transformation of yogi into a term for somebody who attends a class twice a week is very recent, and it is arguably the largest single shift in the vocabulary.
A Word Doing Too Much
Several scholars have argued that yoga has grown so broad that it no longer functions as a category. It now covers a medieval hatha practitioner attempting to wake dormant energy, a Vedantic philosopher pursuing recognition of non-duality, a Gita reader trying to work without craving results, and somebody in a studio in Delhi or Denver stretching after work.
Those are not variations on one activity. They are different projects that happen to share a name. The counter-argument is that the root sense holds them together anyway. Every one of them is a yoking. Something is being harnessed, disciplined, brought under direction and pointed somewhere it would not go on its own.
Which is, more or less, what the Rigveda meant when it was talking about horses.
What Yoga Means: Common Questions
What does the word yoga mean?
It comes from the Sanskrit root yuj, to yoke or join. Its earliest Vedic uses are literal, referring to harnessing animals to a chariot.
Does yoga mean union? That is one of three main senses, and it reflects the Vedantic reading. Yoga also means discipline, and Patanjali defines it as the stilling of the mind’s fluctuations.
How does Patanjali define yoga?
In sutra 1.2: yogash chitta vritti nirodhah, yoga is the stilling of the fluctuations of the mind.
Is yoga the same as physical postures?
No. Asana, posture, is one of eight limbs in Patanjali’s system and occupies three sutras out of 196.
When did yoga stop meaning yoking animals?
The Katha Upanishad, around the fifth to fourth century BCE, contains the earliest clear spiritual use of the word.
Why do definitions of yoga conflict?
Because different schools have different goals. Vedanta aims at union, while Patanjali’s Samkhya framework aims at kaivalya, the disentanglement of consciousness from matter.
Sources consulted: The Principal Upanishads, S. Radhakrishnan; Edwin Bryant, The Yoga Sutras of Patañjali (2009); James Mallinson and Mark Singleton, Roots of Yoga (2017); Barbara Stoler Miller’s translation of the Bhagavad Gita.
Sources and further reading
Primary texts are linked in public-domain translations where one exists; modern scholarship is linked to the publisher.
- James Mallinson and Mark Singleton, Roots of Yoga (Penguin Classics)
- The Yoga Sutras of Patanjali, translated by Charles Johnston
- The Rig Veda, translated by Ralph T. H. Griffith
- Encyclopaedia Britannica, Yoga Sutras
- Light on Yoga, 1966: The Book That Standardised the Poses
- The Yoga Vasistha: The Longest Argument That Nothing Is Happening
- The Hatha Yoga Pradipika: How a Fifteenth-Century Compilation Became the Standard
- The Amritasiddhi: The Oldest Hatha Text Is Not What Anyone Expected
- The Samkhya Karika: The System Yoga Is Built On
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