1) Hindu philosophical concept 
the same as Kosa, which see.
A Kosha (also, Kosa) (Sanskrit कोश, IAST: {IAST|kośa}), usually rendered `sheath`, one of five coverings of the Atman, or Self according to Vedantic philosophy. They are often visualised as the layers of an onion. ==Origins== The five sheaths (pancha-kosas) are described in the Taittiriya Upanishad. From gross to fine they are: According .....
sheath or body; realm of experience and existence.
any of the five layers of physical and mental being composing the personal self, Atman being within the innermost layer.