subject

A branch of knowledge.

“teachers should be well trained in their subject”

(grammar) one of the two main constituents of a sentence; the grammatical constituent about which something is predicated.

(logic) the first term of a proposition.

A person who owes allegiance to that nation.

“a monarch has a duty to his subjects”

The subject matter of a conversation or discussion.

“he didn't want to discuss that subject”

Something (a person or object or scene) selected by an artist or photographer for graphic representation.

“a moving picture of a train is more dramatic than a still picture of the same subject”

A person who is subjected to experimental or other observational procedures; someone who is an object of investigation.

“the subjects for this investigation were selected randomly”

Some situation or event that is thought about.

“he had been thinking about the subject for several years”

Cause to experience or suffer or make liable or vulnerable to.

“He subjected me to his awful poetry”

“The sergeant subjected the new recruits to many drills”

Make accountable for.

“He did not want to subject himself to the judgments of his superiors”

Make subservient; force to submit or subdue.

Likely to be affected by something.

“the bond is subject to taxation”

“he is subject to fits of depression”

Possibly accepting or permitting.

“the time is fixed by the director and players and therefore subject to much variation”

Being under the power or sovereignty of another or others.

“subject peoples”