1. (a.) Double; twofold.
2. (n.) That which exactly resembles or corresponds to something else; another, correspondent to the first; hence, a copy; a transcript; a counterpart.
3. (n.) 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.
4. (v. t.) To double; to fold; to render double.
5. (v. t.) To make a duplicate of (something); to make a copy or transcript of.
6. (v. t.) To divide into two by natural growth or spontaneous action; as, infusoria duplicate themselves.
Thesaurus Entries
Doppelganger, Janus-like, Photostat, Xerox, Xerox copy, actual thing, alike, all one, all the same, ambidextrous, analogous, bifacial, bifold, biform, bilateral, binary, binate, biparous, bivalent, carbon, carbon copy, clone, come again, companion, comparable, conduplicate, conduplication, consubstantial, copy, copying, correspondent, corresponding, counterpart, dead ringer, disomatous, ditto, do a repeat, do again, do over, double, double-faced, doubling, dual, dupe, duple, duplex, duplication, echo, effigy, equal, equivalent, exact counterpart, exact likeness, exactly alike, facsimile, fellow, geminate, geminated, gemination, hectograph, homograph, homonym, homoousian, homophone, icon, idem, identic, identical, identical same, idol, image, imitate, imitation, indistinguishable, ingeminate, ingemination, iteration, just alike, like, likeness, living image, living picture, make over, manifold, match, matching, mate, microcopy, microfilm, mimeo, mimeograph, miniature, mirroring, model, multigraph, multiply by two, no other, none other, of a kind, of a piece, of a size, one, parallel, paralleling, parrot, photocopy, photograph, picture, plagiarize, portrait, quadruplicate, quote, re-create, re-form, rebuild, reconstitute, reconstruct, redesign, redo, redouble, reduplicate, reduplication, reecho, reestablish, refashion, reflection, refound, regenerate, regurgitate, reincarnate, reinstitute, reissue, reiteration, remake, renew, renovate, reorganize, repeat, repetition, replica, replicate, replication, representation, reprint, reproduce, reproduction, resemblance, reshape, restore, restructure, resurrect, revise, revive, rubbing, same, say again, second, secondary, selfsame, semblance, shadow, similitude, simulacrum, spit and image, spitting image, stat, synonym, tantamount, the same, the same difference, trace, tracing, transcribe, triplicate, twin, twinned, twinning, two-faced, two-level, two-ply, two-sided, two-story, twofold, undifferent, very image, very picture, very same, without difference, without distinction
