A Subject

1. (grammar) In a clause: the word or word group (usually a noun phrase) about whom the statement is made. In active clauses with verbs denoting an action, the subject and the actor are usually the same.
2. An actor; one who takes action.
3. The main topic of a paper, work of art, discussion, field of study, etc.
4. A particular area of study.
5. A citizen in a monarchy.
6. A person ruled over by another, especially a monarch or state authority.
7. (music) The main theme or melody, especially in a fugue.
8. A human, animal or an inanimate object that is being examined, treated, analysed, etc.
9. (philosophy) A being that has subjective experiences, subjective consciousness, or a relationship with another entity.
10. (logic) That of which something is stated.
11. (mathematics) The variable in terms of which an expression is defined.

Making x the subject of x² − 6x + 3y = 0, we have x = 3 ± √(9 − 3y).

Synonyms

• (discussion): matter, topic

A particular area of study.

A citizen in a monarchy.

A person ruled over by another, especially a monarch or state authority.

(music) The main theme or melody, especially in a fugue.

A human, animal or an inanimate object that is being examined, treated, analysed, etc.

(philosophy) A being that has subjective experiences, subjective consciousness, or a relationship with another entity.

(logic) That of which something is stated.

(mathematics) The variable in terms of which an expression is defined.

Synonyms

(discussion): matter, topic