Subject

1. that which forms a basic matter of thought, discussion, investigation, etc.: a subject of conversation. 2. a branch of knowledge as a course of study: He studied four subjects in his first year at college. 3. a motive, cause, or ground: a subject for complaint. 4. the theme of a sermon, book, story, etc. 5. the principal melodic motif or phrase in a musical composition, especially in a fugue. 6. an object, scene, incident, etc., chosen by an artist for representation, or as represented in art. 7. a person who is under the dominion or rule of a sovereign. 8. a person who owes allegiance to a government and lives under its protection: four subjects of Sweden. 9. Grammar. (in English and many other languages) a syntactic unit that functions as one of the two main constituents of a simple sentence, the other being the predicate, and that consists of a noun, noun phrase, or noun substitute which often refers to the one performing the action or being in the state expressed by the predicate, as He in He gave notice. 10. a person or thing that undergoes or may undergo some action: As a dissenter, he found himself the subject of the group's animosity. 11. a person or thing under the control or influence of another. 12. a person as an object of medical, surgical, or psychological treatment or experiment. 13. a cadaver used for dissection. 14. Logic. that term of a proposition concerning which the predicate is affirmed or denied. 15. Philosophy. that which thinks, feels, perceives, intends, etc., as contrasted with the objects of thought, feeling, etc. the self or ego. 16. Metaphysics. that in which qualities or attributes inhere; substance.