A course or area of study: Math is her best subject. Being in a position or in circumstances that place one under the power or authority of another or others: subject to the law. Prone; disposed: a child who is subject to colds. Likely to incur or receive; exposed: a directive subject to misinterpretation. Contingent or dependent: a vacation subject to changing weather. One who is under the rule of another or others, especially one who owes allegiance to a government or ruler. One concerning which something is said or done: a subject of gossip. Something that is treated or indicated in a work of art. Music A theme of a composition, especially a fugue. A basis for action; a cause. One that experiences or is subjected to something: the subject of ridicule. A person or animal that is the object of medical or scientific study: The experiment involved 12 subjects. A corpse intended for anatomical study and dissection. One who is under surveillance: The subject was observed leaving the scene of the murder. 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. Logic The term of a proposition about which something is affirmed or denied. Philosophy The essential nature or substance of something as distinguished from its attributes. Philosophy The mind or thinking part as distinguished from the object of thought. To submit for consideration. To submit to the authority of. To expose to something: patients subjected to infection. To cause to experience: subjected to extreme weather. To subjugate; subdue.