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Bhagavad-gitā  As It Is
Sac-cid-ānanda vigraha —( sat —eternal existence +  cit —knowledge +  ānanda —bliss;  vigraha —form) the eternal form of the Supreme Lord, which is full of bliss and knowledge; or, the eternal transcendental form of the living entity.
Sādhaka   = one who is a suitable candidate for liberation.
Sādhu —holy man, devotee.
Saguna —possessing attributes (when applied to God, refers to spiritual qualities).
Sahadeva—one of the vounger brothers of Ariuna.
Samādhi   – trance, absorption in consciousness of God.
Samāna-vāyu —the internal bodily air which adjusts equilibrium. It is one of the five bodily airs controlled by the breathing exercises of the  aṣṭāṅga-yoga  system.
Sanātana —eternal...
Sanātana-dhāma —the eternal abode, the  Vaikuṇṭha  planets in the spiritual sky.
Sanātana-dhārma —the eternal religion of the living being—to render service to the Supreme Lord.
Sanātana Gosvāmī—one of the six great spiritual masters of Vṛndāvana who were authorized by Lord Caitanya Mahāprabhu to establish and distribute the philosophy of Kṛṣṇa consciousness.
Sanātana-yoga —eternal activities performed by the living entity.
Sañjaya—the secretary of Dhṛtarāṣṭra who related  Bhagavad-gītā  to Dhṛtarāṣṭra asit was being spoken on the Battlefield of Kurukṣetra.
Śaṅkarācārya—an incarnation of Lord Śiva who appeared in the Eighth Century to propagate an impersonalist philosophy with the aim of erasing Buddhism from India and reestablishing the authority of the  Vedas .
Sāṅkhya —(1) the devotional  yoga  process described by Lord Kapila in  Śrīmad-Bhāgavatam ; (2) analytical understanding of the body and the soul.
Saṅkīrtana-yajña —the sacrifice prescribed for the age of Kali; that is, congregational chanting of the name, fame and pastimes of the Supreme Personality of Godhead.
Sannyāsa —the renounced order of life, which is free from family relationships and in which all activities are completely dedicated to Kṛṣṇa.
Sāstra —revealed scripture..
Sattva —the mode of goodness of material nature...