Duple ratio(Math.), that in which the antecedent term is double the consequent, as of 2 to 1, 8 to 4, etc.

Duplex
(||Du"plex) a. [L., fr. duo two + plicare to fold. See Two, and Complex.] Double; twofold.

Duplex escapement, a peculiar kind of watch escapement, in which the scape-wheel has two sets of teeth. See Escapement.Duplex lathe, one for turning off, screwing, and surfacing, by means of two cutting tools, on opposite sides of the piece operated upon.Duplex pumping engine, a steam pump in which two steam cylinders are placed side by side, one operating the valves of the other.Duplex querela[L., double complaint] (Eccl. Law), a complaint in the nature of an appeal from the ordinary to his immediate superior, as from a bishop to an archbishop. Mozley & W.Duplex telegraphy, a system of telegraphy for sending two messages over the same wire simultaneously. Duplex watch, one with a duplex escapement.

Duplicate
(Du"pli*cate) a. [L. duplicatus, p. p. of duplicare to double, fr. duplex double, twofold. See Duplex.] Double; twofold.

Duplicate proportionor 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.

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.

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.

Duplicate
(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.

Duplication
(Du`pli*ca"tion) n. [L. duplicatio: cf. F. duplication.]

1. The act of duplicating, or the state of being duplicated; a doubling; a folding over; a fold.

2. (Biol.) The act or process of dividing by natural growth or spontaneous action; as, the duplication of cartilage cells. Carpenter.

Duplication of the cube(Math.), the operation of finding a cube having a volume which is double that of a given cube.

Dupery
(Dup"er*y) n. [F. duperie, fr. duper.] The act or practice of duping. [R.]

Dupion
(Du"pi*on) n. [F. doupion, It. doppione, fr. doppio double, L. duplus. See Double, and cf. Doubloon.] A double cocoon, made by two silkworms.

Duple
(Du"ple) a. [L. duplus. See Double.] Double.

By PanEris using Melati.

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