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At is a preposition.

One quick test of a preposition is whether you can put it in front of a noun, like this:

at the deli

in the end

before a noun

The word "at" as a Noun

  1. 100 at equal 1 kip in Laos
  2. A highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium

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