<p><strong>Noun</strong></p><ul><li>that which forms a basic matter of thought, discussion, investigation, etc.: a subject of conversation.</li><li>a branch of knowledge as a course of study: He studied four subjects in his first year at college.</li><li>a motive, cause, or ground: a subject for complaint.</li><li>the theme of a sermon, book, story, etc.</li><li>the principal melodic motif or phrase in a musical composition, especially in a fugue.</li><li>an object, scene, incident, etc., chosen by an artist for representation, or as represented in art.</li><li>a person who is under the dominion or rule of a sovereign.</li><li>a person who owes allegiance to a government and lives under its protection: Swedish subjects are guaranteed access to equal education in childhood.</li><li>Grammar. (in many languages, such as English) one of the two main parts of a sentence, containing a noun or pronoun and all of its modifiers, which generally refers to the one performing an action, experiencing a condition, or being in a state expressed by a verb: for example, Our best employee in Our best employee gave notice, or He in He is still here.</li><li>a person or thing that undergoes or may undergo some action: As a dissenter, he found himself the subject of the group's animosity.</li><li>a person or thing under the control or influence of another.</li><li>a person as an object of medical, surgical, or psychological treatment or experiment.</li><li>a cadaver used for dissection.</li><li>Logic. that term of a proposition concerning which the predicate is affirmed or denied.</li><li>Philosophy. that which thinks, feels, perceives, intends, etc., as contrasted with the objects of thought, feeling, etc. the self or ego.</li><li>Metaphysics. that in which qualities or attributes inhere; substance.</li></ul><p><strong>Adjective</strong></p><ul><li>being under domination, control, or influence (often followed by to).</li><li>being under dominion, rule, or authority, as of a sovereign, state, or some governing power; owing allegiance or obedience (often followed by to).</li><li>open or exposed (usually followed by to): subject to ridicule.</li><li>being dependent or conditional upon something (usually followed by to): His consent is subject to your approval.</li><li>being under the necessity of undergoing something (usually followed by to): All beings are subject to death.</li><li>liable; prone (usually followed by to): subject to headaches.</li></ul><p><strong>Verb</strong></p><ul><li>to bring under domination, control, or influence (usually followed by to).</li><li>to bring under dominion, rule, or authority, as of a conqueror or a governing power (usually followed by to).</li><li>to cause to undergo the action of something specified; expose (usually followed by to): to subject metal to intense heat.</li><li>to make liable or vulnerable; lay open; expose (usually followed by to): to subject oneself to ridicule.</li><li>Obsolete. to place beneath something; make subjacent.</li></ul>