According to Shabdakalpadhruma the term Pramana (प्रमाणम्) is derived from the dhatu मा (मा॒ माने) used in the sense of measurement and cognition with an upasarga (prefix) प्र which is used in the sense of प्रकृष्टः and the pratyaya (suffix) lyut (ल्युट्). The suffix 'lyut', being in the instrumental case. Pramana means the instrument by which some thing is rightly cognized.
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According to Shabdakalpadhruma the term Pramana (प्रमाणम्) is derived from the dhatu मा (मा॒ङ् माने) used in the sense of measurement and cognition with an upasarga (prefix) प्र which is used in the sense of प्रकृष्टः and the pratyaya (suffix) lyut (ल्युट्). The suffix 'lyut', being in the instrumental case. Pramana means the instrument by which some thing is rightly cognized. According to Prof. Korada Subrahmanyam,<ref>Paper Presentation by Prof. K. Subrahmanayam titled ''[https://groups.google.com/d/msg/bvparishat/xY1Y-wdPeSo/CKzUaFPABwAJ Pramāṇas in Indian Philosophy]'' </ref> <blockquote>''Pramāṇa is the instrument by which the reality of essence of anything is ascertained (प्रमीयते परिच्छिद्यते वस्तुतत्त्वं येन तत्प्रमाणम् – माङ् माने or डुमिञ् प्रक्षेपणे – करणे ल्युट् – करणाधिकरणयोश्च पा<sup>०</sup> ३-३-११७, प्रमाकरणं प्रमाणम्).''</blockquote>The word Pramana signifies the instrument because (it is derived as) "by this is rightly known" (Pramiyate anena). Loosely the term stands for knowledge as well as for the means of valid knowledge but in Nyaya logic it is generally used in the second sense.<ref name=":1" />
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The word Pramana signifies the instrument because (it is derived as) "by this is rightly known" (Pramiyate anena). Loosely the term stands for knowledge as well as for the means of valid knowledge but in Nyaya logic it is generally used in the second sense.<ref name=":1" />