Definitions of subject:

• noun:   something (a person or object or scene) selected by an artist or photographer for graphic representation

  Example: "A moving picture of a train is more dramatic than a still picture of the same subject"

• noun:   (grammar) one of the two main constituents of a sentence; the grammatical constituent about which something is predicated
• noun:   (logic) the first term of a proposition
• noun:   the subject matter of a conversation or discussion

  Example: "He didn't want to discuss that subject"

• noun:   a person who is subjected to experimental or other observational procedures; someone who is an object of investigation

  Example: "The subjects for this investigation were selected randomly"

• noun:   some situation or event that is thought about

  Example: "He had been thinking about the subject for several years"

• noun:   a branch of knowledge

  Example: "Teachers should be well trained in their subject"

• noun:   a person who owes allegiance to that nation

  Example: "A monarch has a duty to his subjects"

• verb:   cause to experience or suffer or make liable or vulnerable to

  Example: "He subjected me to his awful poetry"

• verb:   make accountable for

  Example: "He did not want to subject himself to the judgments of his superiors"

• verb:   make subservient; force to submit or subdue
• verb:   refer for judgment or consideration
• adjective:   being under the power or sovereignty of another or others

  Example: "Subject peoples"

• adjective:   possibly accepting or permitting

  Example: "The time is fixed by the director and players and therefore subject to much variation"