What is "kosha"

n. 1 (context philosophy English) five sheaths that are thought to cover the Atman, or True Self, according to Vedantic philosophy 2 a particular type of Sanskrit dictionary

A Kosha (also Kosa; Sanskrit कोश, IAST: ), usually rendered "sheath", is a covering of the Atman, or Self according to Vedantic philosophy. There are five Koshas, and they are often visualised as the layers of an onion.