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Definition of duplicate:

  1. 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.
  2. Double; twofold.
  3. That which exactly resembles or corresponds to something else; another, correspondent to the first; hence, a copy; a transcript; a counterpart.
  4. To divide into two by natural growth or spontaneous action; as, infusoria duplicate themselves.
  5. To double; to fold; to render double.
  6. To make a duplicate of ( something); to make a copy or transcript of.


supernumerary, companion, biform, equal, transcript, uniform, double up, even, run off, simulacre, part, twin, pair, dub, twinned, spear carrier, steady, portrait, matched, couple, knock off, repeat, duplication, fellow, spitting image, coequal, match, matching, forgery, original, replicate, mate, carbon copy, take over, double over, reduplicate, ingeminate, tracing, counterpart, forge, collimate, another, ringer, same old, same old, same, reprize, retell, gemination, twofold, consistent, picture, fake, retroflex, reprise, extra, double, geminate, reduplication, different, parallel, restate.

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