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the (EN)
article, adverb, preposition

article “the”

definite article the
  1. the definite article used before a noun
    The cat sat on the windowsill, basking in the sunlight.
  2. used to turn a superlative or an ordinal number into a noun
    He was the first, i.e. the best.
  3. used to refer to all individuals or things described by a particular adjective
    The rich and the poor have very different life experiences.

adverb “the”

the (more/most)
  1. indicates that as one thing becomes more significant, another thing becomes more significant in response
    The more I learn, the more I realize how much I don't know.

preposition “the”

the
  1. for each, per
    Gasoline was sold at four dollars the gallon.