Definition of subject

• the subject matter of a conversation or discussion; "he didnt want to discuss that subject"; "it was a very sensitive topic"; "his letters were always on the theme of love"
• some situation or event that is thought about; "he kept drifting off the topic"; "he had been thinking about the subject for several years"; "it is a matter for the police"
• a branch of knowledge; "in what discipline is his doctorate?"; "teachers should be well trained in their subject"; "anthropology is the study of human beings"