Noun, Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no'
1. secret; secrecy; confidentiality; privacy
2. mystery
3. secret (e.g. to success)See also 秘訣
4. esoteric teachingsBuddhism
Wikipedia definition
5. SecrecySecrecy (also called clandestinity or furtiveness) is the practice of hiding information from certain individuals or groups, perhaps while sharing it with other individuals. That which is kept hidden is known as the secret. Secrecy is often controversial, depending on the content of the secret, the group or people keeping the secret, and the motivation for secrecy.
Read “Secrecy” on English Wikipedia
Read “秘密” on Japanese Wikipedia
Read “Secrecy” on DBpedia


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