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The word "the" is a definite article in English grammar. It is used before a noun to indicate that the noun is specific or known to the speaker and listener. It denotes something that has already been mentioned, is under discussion, implied, or presumed familiar. "The" can be used with singular, plural, and uncountable nouns regardless of gender. It is the most frequently used word in the English language and can also be stressed for emphasis or used as an adverb in some contexts to indicate comparison or extent.