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Tapasya —voluntary acceptance of some material trouble for progress in spiritual life.
Tattvavit —one who knows the Absolute Truth in His three different features.
Tretā-yuga—the second age in the cycle of a  mahā-yuga . It lasts for 864,000 years.
Tulasī —a great devotee in the form of a plant. This plant is very dear to the Lord, and its leaves are always offered to His lotus feet.
Tyāga   – renunciation of activities performed with material consciousness.
नाम प्राप्त करने के लिए प्रायः प्राणी को प्राणी कहा जाता है।
Uccaiḥśravā—a horse born from nectar and considered to be a representative of Kṛṣṇa.
Udāna-vāyu —bodily air which moves upwards and which is controlled by the breathing exercises of the  aṣṭānga-yoga  system.
Upaniṣads —the philosophical portions of the  Vedas , as  Īśa   Upaniṣad ,  Kena   Upaniṣad , etc. They are 108 in number.
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Vaibhāṣikas —a class of philosophers, akin to the Buddhists, who existed when Lord Kṛṣṇa spoke  Bhagavad-gītā  and who accept that life is a product of a mature combination of material elements.
Vaikunţhas—(lit., without anxiety) the eternal planets of the spiritual sky.
Vairāgya —detachment from matter and engagement of the mind in spirit.
Vaisnava—a devotee of the Supreme Lord Visnu, or Krṣṇa.
Vaišya —the class of men involved in business and farming, according to the system of four social orders and four spiritual orders.
Vānaprastha —retired life, in which one quits home and travels from holy place to holy place in preparation for the renounced order of life.
Varāha- the incarnation of Lord Kṛṣṇa as a gigantic boar.
Vasudeva—the father of Lord Krṣṇa...
Vāsudeva–(1) Lord Kṛṣṇa, “the son of Vasudeva”; (2) the state of pure goodness, which transcends the material modes of nature and in which one can understand the Supreme Lord.
Vedānta-sūtra (Brahma-sūtra) —the philosophical treatise written by Vyāsadeva to give the conclusion of all the  Vedas .
Vedas —the four Vedic scriptures ( Rg ,  Yajur ,  Sāma  and  Atharva-Vedas ) and their supplements, the  Purāṇas ,  Mahābhārata ,  Vedānta-sūtra , etc.
Vibhu-ātmā —the Supersoul...