Dear Alakendu Das,
First, may I suggest that you use the International Alphabet of Sanskrit Transliteration for writing Sanskrit words? This is what Indologists are accustomed to. Thus, your vigyan would be written as vijñÄna.
As you noted in your query of Nov. 13, the meaning of vijñÄna
in Buddhist texts somewhat differs from its meaning in Hindu texts. In both cases, the meaning of
vijñÄna comes out in juxtaposition with jñÄna. An article on this by Franklin Edgerton was published in 1933, "JñÄna and
vijñÄna," drawing on Hindu texts. I have scanned my photocopy of it and attached a PDF of the scan.
Best regards,
David Reigle
Colorado, U.S.A.