Duplicate word meaning and definition

[noun] a copy that corresponds to an original exactly; "he made a duplicate for the files"
[noun] something additional of the same kind; "he always carried extras in case of an emergency"
[adjective] being two identical
[adjective] identically copied from an original; "a duplicate key"
[verb] increase twofold; "The population doubled within 50 years"
[verb] make or do or perform again; "He could never replicate his brilliant performance of the magic trick"
[verb] make a duplicate or duplicates of; "Could you please duplicate this letter for me?"
[verb] duplicate or match; "The polished surface twinned his face and chest in reverse"

\Du"pli*cate\, a. [L. duplicatus, p. p. of duplicare to double, fr. duplex double, twofold. See {Duplex}.] Double; twofold. {Duplicate proportion} or {ratio} (Math.), the proportion or ratio of squares. Thus, in geometrical proportion, the first term to the third is said to be in a duplicate ratio of the first to the second, or as its square is to the square of the second. Thus, in 2, 4, 8, 16, the ratio of 2 to 8 is a duplicate of that of 2 to 4, or as the square of 2 is to the square of 4.
\Du"pli*cate\, n. 1. That which exactly resembles or corresponds to something else; another, correspondent to the first; hence, a copy; a transcript; a counterpart. I send a duplicate both of it and my last dispatch. -- Sir W. Temple. 2. (Law) 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. --Burrill.
\Du"pli*cate\, v. t. [imp. & p. p. {Duplicated}; p. pr. & vb. n. {Duplicating}.] 1. To double; to fold; to render double. 2. To make a duplicate of (something); to make a copy or transcript of. --Glanvill. 3. (Biol.) To divide into two by natural growth or spontaneous action; as, infusoria duplicate themselves.

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