Literally, yoga means “union.” When you are in yoga, it means that in your experience, everything has become one. This is the essence of the science. This is also its deepest aim.

Yoga is the union of that which has become separated in the play of the universe with its own true self, origin and universality.

Another meaning of the word yoga is “to tie the strands of the mind together.

Yoga is the science that teaches you the method of uniting the individual will with the Cosmic Will. Yoga transmutes the unregenerate nature and increases energy, vitality, vigour, and bestows longevity and a high standard of health. Try to increase the power of concentration. Japa will help you to have a one-pointed mind. (What Is Actual Yoga)

Properly speaking, Yoga is an adjunct to religion and has always been treated as such in India, the country of its birth. The word Yoga is derived from the Sanskrit root yuj which means to yoke or join. As such, Yoga signifies the union of the individual soul with universal Consciousness or, in the language of the Upanishads, with the uncreated, all-pervading Brahman.

Yoga is skill in action.

Yoga is not a religion. It is a science, science of well-being, science of youthfulness, science of integrating body, mind and soul.

Yoga is defined as a method – the process of nirodha (mental control) – by which union (the goal of yoga) is achieved. Yoga is therefore both the process of nirodha and the unqualified state of niruddha (the perfection of that process). The word yoga (union) implies duality (as in joining of two things or principles); the result of yoga is the nondual state..., or as the union of the lower self and higher Self. The nondual state is characterized by the absence of individuality; it can be described as eternal peace, pure love, Self-realization, or liberation.

Yoga is the cessation of movements of the mind. Then there is abiding in the seer's own form.

That which we know as Yoga is the method by which evolution is quickened in the individual, and all the powers of the Self, up to the threshold of divinity, may by it be brought into manifestation in the man of the present. That is why Yoga training was necessary for the ancient scientist; he must develop in himself the three aspects of God, if he were to understand them as manifested in the universe around him. Now, at our own stage of evolution, it is specially the life of Brahmâ—or the Brahmâ aspect of God—with which the human mind is coming into touch, because the mind in man is the reflection of the universal mind in Kosmos. That life is the life that is the force in the atom, that vivifies every atom, nay, that brings the atom into existence, as we shall see, and remains during the whole of the growth of the universe as the fundamental life that keeps those atoms as active particles building up innumerable forms.

A human is not a being; he is a becoming. He is an ongoing process – a possibility. For this possibility to be made use of, there is a whole system of understanding the mechanics of how this life functions and what we can do with it, which we refer to as yoga.

The word ‘yoga’ literally means ‘union’. When you experience everything as one in your consciousness, then you are in yoga. -Sadhguru

Yoga is fundamentally aimed at enhancing your experience beyond the five senses.

The source of my father’s teaching, and the essence of Yoga, was formulated by the great Indian sage, Patanjali, more than two thousand years ago in this succinct definition: Yoga is the ability to direct the mind exclusively toward an object and sustain that direction without any distractions.