What is the absolute literal translation and conceptual meaning of the Sanskrit word Upanishad within Vedic philosophy?

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The term Upanishad is derived from the roots upa meaning near, ni meaning down, and shad meaning to sit. It literally translates to sitting down near a spiritual master to learn the esoteric doctrines about Atman and Brahman, marking the culmination of the Vedic knowledge loop known as Vedanta.

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