duplus

1. Duplex (δίπλαξ) denotes double, as distinct magnitudes to be counted: duplum (διπλοῦν) as continuous magnitudes to be weighed or measured. Duplex is used as an adjective, duplum as a substantive. Quintil. viii. 6, 42. In quo et numerus est duplex et duplum virium. 2. In duplex (as in διπλοῦς), doubleness is the primary, similarity and equality the secondary notion; in geminus (as in δίδυμος), the notion of similarity and equality is the primary, that of doubleness the secondary one. In Cic. Part. 6. Verba geminata et duplicata vel etiam sæpius iterata; the word geminata refers to the repetition of the same notion by synonymes; duplicata to the repetition of the same word. 3. Dupliciter is always modal; in two different manners, with double purpose; bifariam is local, in two places, or two parts. Cic. Fam. ix. 20. Dupliciter delectatus sum literis tuis; compare with Tusc. iii. 11. Bifariam quatuor perturbationes æqualiter distributæ sunt. (v. 281.)