Definitions
1.noun(grammar) In a clause: the word or word group (usually a noun phrase) that is dealt with. In active clauses with verbs denoting an action, the subject and the actor are usually the same."In the sentence ‘The mouse is eaten by the cat in the kitchen.’, ‘The mouse’ is the subject, ‘the cat’ being the agent."
2.nounAn actor; one who takes action."The subjects and objects of power."
3.nounThe main topic of a paper, work of art, discussion, field of study, etc.
4.nounA particular area of study."Her favorite subject is physics."
5.nounA citizen in a monarchy."I am a British subject."
6.nounA person ruled over by another, especially a monarch or state authority.
7.nounThe main theme or melody, especially in a fugue.
8.nounA human, animal or an inanimate object that is being examined, treated, analysed, etc.
9.nounA being that has subjective experiences, subjective consciousness, or a relationship with another entity.
10.nounThat of which something is stated.
11.nounThe variable in terms of which an expression is defined."Making x the subject of x2 − 6x + 3y = 0, we have x = 3 ± √(9 − 3y)."