a state of deep mental absorption; "she is in a deep study"

a room used for reading and writing and studying; "he knocked lightly on the closed door of the study"

a single room, usually not huge, so one cannot be deep within

Space used primarily as study rooms, stacks, open-stack reading rooms, and library processing rooms.

A study is a room in a house which is used for paperwork, computer work, or reading. Historically, the study of a house was reserved for use as the private office and reading room of a family father as the formal head of a household, but today studies are generally either used to operate a home business or else open to the whole family.