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The Collaborative International Dictionary of English v.0.48 (gcide)

Duplicate \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.
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I send a duplicate both of it and my last dispatch.
-- Sir W.
Temple.
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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.
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Duplicate \Du"pli*cate\, v. t. [imp. & p. p. {Duplicated}; p.
pr. & vb. n. {Duplicating}.]
1. To double; to fold; to render double.
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2. To make a duplicate of (something); to make a copy or
transcript of. --Glanvill.
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3. (Biol.) To divide into two by natural growth or
spontaneous action; as, infusoria duplicate themselves.
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duplicate \du"pli*cate\, a. [L. duplicatus, p. p. of duplicare
to double, fr. duplex double, twofold. See {Duplex}.]
Double; twofold.
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{Duplicate proportion} or {Duplicate 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.
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