adj double; twofold.
2. duplicate ·vt to make a duplicate of (something); to make a copy or transcript of.
3. duplicate ·vt to double; to fold; to render double.
4. duplicate ·vt to divide into two by natural growth or spontaneous action; as, infusoria duplicate themselves.
5. duplicate ·noun that which exactly resembles or corresponds to something else; another, correspondent to the first; hence, a copy; a transcript; a counterpart.
6. duplicate ·noun 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.