a. [ L. conduplicatus, p. p. of conduplicare. See Duplicate. ] (Bot.) Folded lengthwise along the midrib, the upper face being within; -- said of leaves or petals in vernation or æstivation. [ 1913 Webster ]

n. [ L. conduplicatio. ] A doubling together or folding; a duplication. [ R. ] [ 1913 Webster ]

n. [ Pref. de- + duplication. ] (Biol.) The division of that which is morphologically one organ into two or more, as the division of an organ of a plant into a pair or cluster. [ 1913 Webster ]

a. [ L. duplus. See Double. ] Double. [ 1913 Webster ]

Duple ratio (Math.), that in which the antecedent term is double the consequent, as of 2 to 1, 8 to 4, etc. [ 1913 Webster ]

‖a. [ L., fr. duo two + plicare to fold. See Two, and Complex. ] 1. Double; twofold. [ 1913 Webster ]

2. (Computers) organized so that data may be transmitted in two opposite directions over the same channel; -- of communications channels, such as data transfer lines between computers. [ PJC ]

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. --
half duplex (Computers) (a) arranged so that the information may be transmitted in both directions, but only in one direction at a time; -- of communications channels between computers; contrasted with full duplex(a). (b) arranged so that the information transmitted to the remote computer also appears on the local terminal; -- of communications channels between computers; contrasted with full duplex(b). --
full duplex, (Computers) (a) arranged so that the information may be transmitted in both directions simultaneously; -- of communications channels between computers; contrasted with half duplex(a). (b) arranged so that the information transmitted to the remote computer does not appear on the local terminal; -- of communications channels between computers; contrasted with half duplex(b). [ 1913 Webster ]

v. t. [ See Duplex, a. ] (Teleg.) To arrange, as a telegraph line, so that two messages may be transmitted simultaneously; to equip with a duplex telegraphic outfit. [ Webster 1913 Suppl. ]

n. [ See Duplex, a. ] 1. something which is duplex; -- used mostly in reference to a living unit, such as an apartment, in a building having two similar living units. [ PJC ]

2. (Biology, Genetics) a double-stranded region in a nucleic acid molecule. See deoxyribonucleic acid. [ PJC ]

n. (Radio) a device which switches electronic circuitry so that a radio antenna can function as either a transmitting or receiving antenna. [ PJC ]

n. the quality of being reproducible.
Syn. -- reproducibility. [ WordNet 1.5 ]

adj. capable of being duplicated. [ WordNet 1.5 ]

n. 1. That which exactly resembles or corresponds to something else; another, correspondent to the first; hence, a copy; a transcript; a counterpart. [ 1913 Webster ]

I send a duplicate both of it and my last dispatch. Sir W. Temple. [ 1913 Webster ]

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. [ 1913 Webster ]

v. t. [ imp. & p. p. Duplicated p. pr. & vb. n. Duplicating. ] 1. To double; to fold; to render double. [ 1913 Webster ]

2. To make a duplicate of (something); to make a copy or transcript of. Glanvill. [ 1913 Webster ]

3. (Biol.) To divide into two by natural growth or spontaneous action; as, infusoria duplicate themselves. [ 1913 Webster ]

a. [ L. duplicatus, p. p. of duplicare to double, fr. duplex double, twofold. See Duplex. ] Double; twofold. [ 1913 Webster ]

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. [ 1913 Webster ]

n. [ L. duplicatio: cf. F. duplication. ] 1. The act of duplicating, or the state of being duplicated; a doubling; a folding over; a fold. [ 1913 Webster ]

2. (Biol.) The act or process of dividing by natural growth or spontaneous action; as, the duplication of cartilage cells. Carpenter. [ 1913 Webster ]

duplication of the cube (Math.), the operation of finding a cube having a volume which is double that of a given cube. [ 1913 Webster ]

a. 1. Having the quality of duplicating or doubling. [ 1913 Webster ]

2. (Biol.) Having the quality of subdividing into two by natural growth. “Duplicative subdivision.” Carpenter. [ 1913 Webster ]

n. [ Cf. F. duplicature. ] A doubling; a fold, as of a membrane. [ 1913 Webster ]

adj. exhibiting duplicity{ 2 }; deceitful; double-dealing.
Syn. -- ambidextrous, deceitful, double-dealing, two-faced. [ WordNet 1.5 ]

n.; pl. duplicities [ F. duplicité, L. duplicitas, fr. duplex double. See Duplex. ] 1. Doubleness; a twofold state. [ Archaic ] [ 1913 Webster ]

Do not affect duplicities nor triplicities, nor any certain number of parts in your division of things. I. Watts. [ 1913 Webster ]

2. Doubleness of heart or speech; insincerity; a sustained form of deception which consists in entertaining or pretending to entertain one set of feelings, and acting as if influenced by another; bad faith. [ 1913 Webster ]

Far from the duplicity wickedly charged on him, he acted his part with alacrity and resolution. Burke. [ 1913 Webster ]

3. (Law) (a) The use of two or more distinct allegations or answers, where one is sufficient. Blackstone. (b) In indictments, the union of two incompatible offenses. Wharton.

Syn. -- Double dealing; dissimulation; deceit; guile; deception; falsehood. [ 1913 Webster ]

a. (Bot.) (a) Having the edges bent abruptly toward the axis; -- said of the parts of the calyx or corolla in æstivation. (b) Having the edges rolled inward and then arranged about the axis without overlapping; -- said of leaves in vernation. [ 1913 Webster ]

a. (Bot.) (a) Having induplicate sepals or petals in æstivation. (b) Having induplicate leaves in vernation. [ 1913 Webster ]

a. [ Pref. re- + duplicate: cf. L. reduplicatus. Cf. Redouble. ] 1. Double; doubled; reduplicative; repeated. [ 1913 Webster ]

2. (Bot.) Valvate with the margins curved outwardly; -- said of the &unr_;stivation of certain flowers. [ 1913 Webster ]

v. t. [ Cf. LL. reduplicare. ] [ 1913 Webster ]

1. To redouble; to multiply; to repeat. [ 1913 Webster ]

2. (Gram.) To repeat the first letter or letters of (a word). See Reduplication, 3. [ 1913 Webster ]

n. [ Cf. F. réduplication, L. reduplicatio repetition. ] 1. The act of doubling, or the state of being doubled. [ 1913 Webster ]

2. (Pros.) A figure in which the first word of a verse is the same as the last word of the preceding verse. [ 1913 Webster ]

3. (Philol.) The doubling of a stem or syllable (more or less modified), with the effect of changing the time expressed, intensifying the meaning, or making the word more imitative; also, the syllable thus added; as, L. tetuli; poposci. [ 1913 Webster ]

a. [ Cf. F. réduplicatif. ] Double; formed by reduplication; reduplicate. I. Watts. [ 1913 Webster ]

a. [ Sesqui- + duplicate. ] Twice and a half as great (as another thing); having the ratio of two and a half to one. [ 1913 Webster ]

Sesquiduplicate ratio (Math.), the ratio of two and a half to one, or one in which the greater term contains the lesser twice and a half, as that of 50 to 20. [ 1913 Webster ]

a. (Math.) Indicating one part of two; in the ratio of one to two. [ 1913 Webster ]

Subduple ratio, the ratio of 1 to 2: thus, 3:6 is a subduple ratio, as 6:3 is a duple ratio. [ 1913 Webster ]

a. (Math.) Expressed by the square root; -- said of ratios. [ 1913 Webster ]

Subduplicate ratio, the ratio of the square roots, or the square root of a ratio; thus, the subduplicate ratio of a to b is √a to √b, or √a/b. [ 1913 Webster ]