Duplicate

1. To divide into two by natural growth or spontaneous action; as, infusoria duplicate themselves.
2. To double; to fold; to render double.
3. To make a duplicate of (something); to make a copy or transcript of.
4. An original instrument repeated; a document which is the same as another in all essential particulars, and differing from a mere copy in having all the validity of an original.
5. That which exactly resembles or corresponds to something else; another, correspondent to the first; hence, a copy; a transcript; a counterpart.
6. Double; twofold.