n.

the subject matter of a conversation or discussion

"he didn't want to discuss that subject"

同義詞：topictheme

some situation or event that is thought about

"he had been thinking about the subject for several years"

同義詞：topicissuematter

a branch of knowledge

"teachers should be well trained in their subject"

同義詞：disciplinesubject areasubject fieldfieldfield of studystudybailiwickbranch of knowledge

something (a person or object or scene) selected by an artist or photographer for graphic representation

"a moving picture of a train is more dramatic than a still picture of the same subject"

同義詞：contentdepicted object

a person who is subjected to experimental or other observational procedures; someone who is an object of investigation

"the subjects for this investigation were selected randomly"

同義詞：caseguinea pig

a person who owes allegiance to that nation

"a monarch has a duty to his subjects"

同義詞：national

(grammar) one of the two main constituents of a sentence; the grammatical constituent about which something is predicated

(logic) the first term of a proposition

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