1.
One who is under the rule of another or others, especially one who owes allegiance to a government or ruler.
2.
a. One concerning which something is said or done: She is a subject of gossip in the office. b. Something that is treated or indicated in a work of art. c. Music. A theme of a composition, especially a fugue.
3. A course or area of study: Math is her best subject.
4. A basis for action; a cause.
5. a. One that experiences or is subjected to something: They made him the subject of ridicule. b. One that is the object of clinical study: The experiment involved 12 subjects. c. One who is under surveillance: The subject was observed leaving the scene of the murder. d. A corpse intended for study and dissection.
6. Grammar. The noun, noun phrase, or pronoun in a sentence or clause that denotes the doer of the action or what is described by the predicate and that in some languages, such as English, can be identified by its characteristic position in simple sentences and in other languages, such as Latin, by inflectional endings.
7. Logic. The term of a proposition about which something is affirmed or denied.
8. Philosophy. a. The essential nature or substance of something as distinguished from its attributes. b. The mind or thinking part as distinguished from the object of thought.