*duplicate*

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 ]

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. [ 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 ]

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 ]