Plural of determiner; words that specify or limit nouns, including articles, demonstratives, possessives, and quantifiers.
From determiner + -s (plural marker). This grammatical category was formalized in modern linguistics to group words that determine which noun is meant.
Linguists discovered that 'the', 'this', 'my', and 'some' all function the same way grammatically—so instead of listing them separately, they created one category: determiners.
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