📒 a thing or person that is being discussed, described or dealt with
📒 an area of knowledge studied in a school, college, etc.
📒 a person or thing that is the main feature of a picture or photograph, or that a work of art is based on
📒 a person or thing being used to study something, especially in an experiment
📒 a noun, noun phrase or pronoun representing the person or thing that performs the action of the verb (I in I sat down.), about which something is stated (the house in the house is very old) or, in a passive sentence, that is affected by the action of the
📒 a person who belongs to a particular country, especially one with a king or queen