a person or thing that is being discussed, described, or dealt with.
I've said all there is to be said on the subject
a branch of knowledge studied or taught in a school, college, or university.
It is important for young people to have training opportunities, but the place for teaching these subjects is at college.
a citizen or member of a state other than its supreme ruler.
In saltana, there are no citizens, only subjects , while the ruler is unaccountable except to God.
a thinking or feeling entity; the conscious mind; the ego, especially as opposed to anything external to the mind.
In the latter case some go as far as speaking unhesitatingly of the mind as a subject - or a self, ego, or even a soul.