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Definition of Upanishad
1. Noun. A later sacred text of Hinduism of a mystical nature dealing with metaphysical questions. "The Vedanta philosophy developed from the pantheistic views of the Upanishads" 
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1. Noun. A later sacred text of Hinduism of a mystical nature dealing with metaphysical questions. "The Vedanta philosophy developed from the pantheistic views of the Upanishads"