|Article: word before a noun or a nominalization. There are definite (the) and indefinite articles (a, an).|
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Indefinite article/Millikan: an indefinite article causes a name plus modification (description) to function purely descriptive. E.g. Henry was bitten by a poisonous snake, not by toxicity or the property of being a snake.
Truth value/Truth: to have a truth value, the sentence must map a situation that involves a particular individual, that is, it must have a real value (> terminology).
N.B.: but it is not important which snake it was exactly, so that the sentence works properly ((s) i.e., performs its eigenfunction).
Definite article/description/Millikan: if it is used with necessary identifying descriptions, it is actually superfluous. It only develops its power with other descriptions.
Unambiguous/determinateness/MillikanVsRussell: the definite article does not have the function of establishing unambiguousness.
Exception: necessarily identifying dsignations, which are purely descriptive. But even then a translation into an inner name is always possible.
Randomly identifying/description/definite article/Millikan: randomly identifying descriptions with "the" are indexical. And relative to the identification function, these are also necessary identifying descriptions.
R. G. Millikan
Language, Thought, and Other Biological Categories: New Foundations for Realism Cambridge 1987