a person or thing that is being discussed, described, or dealt with

I've said all there is to be said on the subject

he's the subject of a major new biography

a branch of knowledge studied or taught in a school, college, or university

maths is not my best subject

a member of a state other than its ruler, especially one owing allegiance to a monarch or other supreme ruler

the legislation is applicable only to British subjects

a noun or noun phrase functioning as one of the main components of a clause, being the element about which the rest of the clause is predicated

a thinking or feeling entity; the conscious mind; the ego, especially as opposed to anything external to the mind

likely or prone to be affected by (a particular condition or occurrence, typically an unwelcome or unpleasant one)

he was subject to bouts of manic depression

dependent or conditional upon

the proposed merger is subject to the approval of the shareholders

under the authority of

ministers are subject to the laws of the land

conditionally upon

subject to the EC's agreement, we intend to set up an enterprise zone in the area

cause or force someone or something to undergo (a particular experience or form of treatment, typically an unwelcome or unpleasant one)

he'd subjected her to a terrifying ordeal

bring (a person or country) under one's control or jurisdiction, typically by using force

the city had been subjected to Macedonian rule