What is the lexico-grammatical meaning and primary function that characterize the English article as a separate class of words?

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Meaning of "action/process" and function of a simple predicate.

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Meaning of "relations between substances" and function of a linking word.

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Meaning of "modality" and function of a parenthetical element.

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Meaning of "definiteness/indefiniteness" and function of a noun specifier.

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