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noun
1.
that which forms a basic matter of thought, discussion, investigation, etc.:
a subject of conversation.
2.
a branch of knowledge as a course of study:
He studied four subjects in his first year at college.
3.
a motive, cause, or ground:
a subject for complaint.
4.
the theme of a sermon, book, story, etc.
5.
the principal melodic motif or phrase in a musical composition, especially in a fugue.
6.
an object, scene, incident, etc., chosen by an artist for representation, or as represented in art.
7.
a person who is under the dominion or rule of a sovereign.
8.
a person who owes allegiance to a government and lives under its protection:
four subjects of Sweden.
9.
Grammar. (in English and many other languages) a syntactic unit that functions as one of the two main constituents of a simple sentence, the other being the predicate, and that consists of a noun, noun phrase, or noun substitute which often refers to the one performing the action or being in the state expressed by the predicate, as He in He gave notice.
10.
a person or thing that undergoes or may undergo some action:
As a dissenter, he found himself the subject of the group’s animosity.
11.
a person or thing under the control or influence of another.
12.
a person as an object of medical, surgical, or psychological treatment or experiment.
13.
a cadaver used for dissection.
14.
Logic. that term of a proposition concerning which the predicate is affirmed or denied.
15.
Philosophy.

that which thinks, feels, perceives, intends, etc., as contrasted with the objects of thought, feeling, etc.
the self or ego.

16.
Metaphysics. that in which qualities or attributes inhere; substance.
adjective
17.
being under domination, control, or influence (often followed by to).
18.
being under dominion, rule, or authority, as of a sovereign, state, or some governing power; owing allegiance or obedience (often followed by to).
19.
open or exposed (usually followed by to):
subject to ridicule.
20.
being dependent or conditional upon something (usually followed by to):
His consent is subject to your approval.
21.
being under the necessity of undergoing something (usually followed by to):
All beings are subject to death.
22.
liable; prone (usually followed by to):
subject to headaches.
verb (used with object)
23.
to bring under domination, control, or influence (usually followed by to).
24.
to bring under dominion, rule, or authority, as of a conqueror or a governing power (usually followed by to).
25.
to cause to undergo the action of something specified; expose (usually followed by to):
to subject metal to intense heat.
26.
to make liable or vulnerable; lay open; expose (usually followed by to):
to subject oneself to ridicule.
27.
Obsolete. to place beneath something; make subjacent.
noun (ˈsʌbdʒɪkt)
1.

the predominant theme or topic, as of a book, discussion, etc
(in combination): subject-heading

2.
any branch of learning considered as a course of study
3.
(grammar, logic) a word, phrase, or formal expression about which something is predicated or stated in a sentence; for example, the cat in the sentence The cat catches mice
4.
a person or thing that undergoes experiment, analysis, treatment, etc
5.
a person who lives under the rule of a monarch, government, etc
6.
an object, figure, scene, etc, as selected by an artist or photographer for representation
7.
(philosophy)

that which thinks or feels as opposed to the object of thinking and feeling; the self or the mind
a substance as opposed to its attributes

8.
(music) Also called theme. a melodic or thematic phrase used as the principal motif of a fugue, the basis from which the musical material is derived in a sonata-form movement, or the recurrent figure in a rondo
9.
(logic)

the term of a categorial statement of which something is predicated
the reference or denotation of the subject term of a statement. The subject of John is tall is not the name John, but John himself

10.
an originating motive
11.
change the subject, to select a new topic of conversation
adjective (ˈsʌbdʒɪkt) (usually postpositive) and foll by to
12.
being under the power or sovereignty of a ruler, government, etc: subject peoples
13.
showing a tendency (towards): a child subject to indiscipline
14.
exposed or vulnerable: subject to ribaldry
15.
conditional upon: the results are subject to correction
adverb
16.
(preposition) subject to, under the condition that: we accept, subject to her agreement
verb (transitive) (səbˈdʒɛkt)
17.
(foll by to) to cause to undergo the application (of): they subjected him to torture
18.
(often passive) foll by to. to expose or render vulnerable or liable (to some experience): he was subjected to great danger
19.
(foll by to) to bring under the control or authority (of): to subject a soldier to discipline
20.
(rare) to subdue or subjugate
21.
(rare) to present for consideration; submit
22.
(obsolete) to place below

subject definition

A part of every sentence. The subject tells what the sentence is about; it contains the main noun or noun phrase: “The car crashed into the railing”; “Judy and two of her friends were elected to the National Honor Society.” In some cases the subject is implied: you is the implied subject in “Get me some orange juice.” (Compare predicate.)

programming
In subject-oriented programming, a subject is a collection of classes or class fragments whose class hierarchy models its domain in its own, subjective way. A subject may be a complete application in itself, or it may be an incomplete fragment that must be composed with other subjects to produce a complete application. Subject composition combines class hierarchies to produce new subjects that incorporate functionality from existing subjects.
(1999-08-31)
In addition to the idiom beginning with subject