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