The word _Yoga_ from the root “_jung_” (Lat.) _Jungere_ means the joining of any two things or numbers together. Amara Kosha gives five different meanings of it as, संयोगे मेलने ध्याने धारने उपायेच; the other Koshas give five others, _viz._, भैषज्ये देह स्थैर्ये कर्म्मकौशले विश्वासघातकेच । 1. In Arithmetic it is अङ्क योग or addition, and योग बिभाग is addition and subtraction. 2. In Astronomy the conjunction of planets and stars ग्रहनक्षत्रादि संयोगः 3. In Grammar it is the joining of letters and words सन्धिः समासः । 4. In Nyáya it means the power of the parts taken together अबयब शक्तिः, तर्क दीपिका । 5. In Mímánsa it is defined to be the force conveyed by the united members of a sentence. In contemplative philosophy it means; 1. According to Pátanjali,—the suppression of mental functions चित्तवृत्ति निरोधः । 2. The Buddhists mean by it—the abstraction of the mind from all objects. सर्ब्बबिषयेभ्यः चित्तनिबृत्ति निरोधः । 3. The Vedanta meaning of it is—जीबात्मा परमात्मनोरैक्यं the union of the human soul with the Supreme spirit. 4. Its meaning in the _Yoga_ system is nearly the same, _i. e._, the joining of the vital spirit with the soul; संयोगं योगमित्याहुर्ज्जीबमात्मनोरिति । 5. Every process of meditation is called also as Yoga. योगाङ्ग योग उच्यते । Others again use it in senses adapted to their own views and subjects; such as the Vaiseshika philosophy uses it to mean, the fixing of the attention to only one subject by abstracting it from all others आत्मनो व्यावृत्त मनसः संयोगो योग उच्यते । 2. The Rámánuja sect define it as the seeking of one’s particular Deity स्वस्व देवतानु सन्धानमिति रामानुजाः । In this sense all sectarian cults are accounted as so many kinds of Yogas by their respective votaries. 3. According to some Buddhists it is the seeking of one’s object of desire अप्राप्तस्यार्थस्य प्राप्तये पर्यानुयोगः । 4. And with others, it is a search after every desirable object. 5. In Rhetoric it means the union of lovers कामुक कामिनी सम्मेलनं । In Medicine it means the compounding of drugs under which head there are many works that are at first sight mistaken for Yoga philosophy. Again there are many compound words with _Yoga_ which mean only “a treatise” on those subjects, such as, works on wisdom, on Acts, on Faith &c., are called ज्ञान योग, क्रिया योग, भक्त्ति योग इत्यादि । . Moreover the words _Yoga_ and _Viyoga_ are used to express the two processes of synthesis and analysis both in the abstract and practical sciences for the combination and disjoining of ideas and things. VI. THE DIFFERENT STAGES OF YOGA.