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It can be, when used to mean "in" or "per" or "in every."

(e.g. The mail comes once a day, once per day).

In English A can be--

  • a noun: I got an A in basketweaving.
  • an indefinite article: He ate a worm.
  • a verb (contraction of "have") I might a eaten a couple worms, too.
  • a preposition: Twice a week I read my English text.
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9y ago

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