Meaning of "subject" in Essential English Dictionary

subject

noun uk /ˈsʌbdʒɪkt/

A1 an area of knowledge studied at school or university:

Chemistry is my favourite subject.

B1 what someone is writing or talking about:

The subject of the programme was mental health.

B1 in grammar, the person or thing that does the action described by a verb. In the sentence ‘Bob phoned me yesterday’, ‘Bob’ is the subject.

someone who is from a particular country:

a British subject

(Definition of “subject” from the Cambridge Essential Dictionary © Cambridge University Press)