duplicate

noun
  1. An exact copy of something, especially a document. noun
    She made a duplicate of the contract for her records.
    The museum displayed a duplicate of the ancient artifact.
  2. To make an exact copy of something. verb
    He duplicated the key so he could have a spare.
    The software allows you to duplicate files easily.
  3. Exactly like something else, especially through having been copied. adjective
    The duplicate keys were indistinguishable from the originals.
    They wore duplicate outfits to the party.