[QUOTE=Philippe*;62836]It is a semantic problem. Yoga does not mean just union. Just one example : In Yoga sutras according to what are considered “classical” commentators such as Vijnana Bhikshu and Vacaspati Mishra, Yoga stems from the Sanskrit root [I]yuj[/I] with the meaning of concentration and not from the root [I]yujir[/I] which implies union. And it makes sense within the Yoga Sutra metaphysics as the goal is the separation between Purusha and Prakriti. In other contexts, the emphasis lies on union. Yoga is a polysemic word, hence the common confusion about concepts expressed by homonyms.
Philippe[/QUOTE]
Adding to the number of meanings of the term yoga for further consideration; cut and pasted below from the internet;
[I]Yoga means to “unite” or “join” the aspects of ourselves which were never really divided in the first place. It also means to “yoke” or to engage ourselves in a self-training program. Yoga means working with each of the levels or aspects of our being individually, and then unifying all of those into their original whole, or Yoga. Yoga is a Sanskrit word coming from the root “yuj” and relates to both the processes or practices referred to as Yoga and also the goal itself, which is also called Yoga. As the goal, the word Yoga is virtually one and the same with the word Samadhi, the deep, transcendent realization of the highest truth or reality.
Definition of Yoga: The first four sutras define Yoga, with that definition being expanded upon in the other sutras. In a systematic process of meditation, you gradually move your attention inward, through all the levels of your being, gaining mastery along the way. Eventually you come to rest in your true nature, which is beyond all of those levels. This action and the realization of this center of consciousness, is the meaning of Yoga.
Yoga is Samadhi, in the yoga tradition, it is the eighth and final limb identified in the Yoga Sūtras of Pata?jali: Yoga means union, literally, to yoke, from the root yuj, which means to join or to integrate. It means to bring together the aspects of ourselves that were never divided in the first place. It means to attain direct experience of the core of that preexisting holistic being who we truly are at the deepest level, and that is attained through samadhi.
Self-realization, the highest goal of Yoga.[/I]