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English definition of “subject”

subject

noun [C] (GRAMMAR)   /ˈsʌb·dʒɪkt, -dʒekt/
grammar the person or thing that performs the action of a verb, or which is joined to a description by a verb: "Bob" is the subject of the sentence, "Bob threw the ball."
(Definition of subject noun (GRAMMAR) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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