Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

90. Duplication — N. duplication; doubling &c v.; gemination,

ingemination†; reduplication; iteration &c (repetition) 104; renewal. V. double, redouble, duplicate, reduplicate; geminate; repeat &c 104; renew &c 660. Adj. double; doubled &c v.; bicipital†, bicephalous†, bidental†, bilabiate, bivalve, bivalvular†, bifold†, biform†, bilateral; bifarious†, bifacial†; twofold, two-sided; disomatous†; duplex; double-faced, double-headed; twin, duplicate, ingeminate†; second. Adv. twice, once more; over again &c (repeatedly) 104; as much again, twofold. secondly, in the second place, again.