If you study, you spend time learning about a particular subject or subjects.

Study is the activity of studying.

A study of a subject is a piece of research on it.

You can refer to educational subjects or courses that contain several elements as studies of a particular kind.

If you study something, you look at it or watch it very carefully, in order to find something out.

If you study something, you consider it or observe it carefully in order to be able to understand it fully.

A study by an artist is a drawing which is done in preparation for a larger picture.

A study is a room in a house which is used for reading, writing, and studying.