Sadhguru describes what the word yoga means and does not mean.

Sadhguru: Essentially in the tradition, once we attach the word yoga to anything, it indicates that it is a complete path by itself. We say hatha yoga, but we will not say asana yoga. Of course, if you come from the United States, they say anything!

The moment you attach the word yoga, it indicates it is a complete path by itself.

If it is a complete path by itself, how should it be approached? If it was just a simple practice or an exercise, you could approach it one way. If it was an art form or just entertainment, it could be approached another way. I am using all these words because they are in usage in todays world. People say recreational yoga, health yoga, people refer to it as an art form they think they are doing a service to yoga by saying it is an art form. No. The moment you attach the word yoga, it indicates it is a complete path by itself.

The word yoga essentially means, that which brings you to reality. Literally, it means union. Union means it brings you to the ultimate reality, where individual manifestations of life are surface bubbles in the process of creation. Right now, a coconut tree and a mango tree have popped up from the same earth. From the same earth, the human body and so many creatures have popped up. It is all the same earth.

Yoga means to move towards an experiential reality where one knows the ultimate nature of the existence, the way it is made.

The word yoga essentially means, that which brings you to reality.

Yoga refers to union not as an idea, a philosophy or as a concept that you imbibe. As an intellectual idea, if you vouch by the commonness of the universe, it may make you popular in a tea party, it may give you a certain social status, but it does not serve any other purpose. You will see, when things come down to even money it does not even have to boil down to life and death even for money, This is me, that is you. The boundary is clear; there is no question of you and me being one.

It actually causes damage to the individual if you intellectually see everything is one. People do all kinds of silly things because they got this idea that everybody is one, before somebody teaches them a good lesson and then they see, This is me, that is you. No way to be one.

If it becomes an experiential reality, it will not bring forth any immature action. It will bring forth a tremendous experience of life. Individuality is an idea. Universality is not an idea, it is a reality. In other words, yoga means you bury all your ideas.

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What is Yoga? - Meaning of Yoga, Meditation Or Exercise - Isha