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duple

I. duple, a. (n.)
    (ˈdjuːp(ə)l)
    [ad. L. duplus double, f. duo two + -plus, from root ple- to fill.]
    A. adj. Double, twofold. Obs. in gen. sense: in Math. applied to the proportion of two quantities one of which is double of the other; in Music, to ‘time’ or rhythm having two beats in the bar.

1542–3 Act 34 & 35 Hen. VIII, c. 27 §47 If it..be with a duple voucher, then sixe shillinges and .viii. d. 1609 Douland Ornith. Microl. 19 For example sake 6 and 12 will make a duple reason [= ratio]. 1656 Stanley Hist. Philos. v. (1701) 162/2 By finding two mean proportionals between two right lines in a Duple proportion. 1664 Butler Hud. ii. ii. 269 A breach of Oath is Duple And either way admits a Scruple. 1725–52 Chambers Cycl. s.v. Time, Common or duple Time is of two species. The first, when every bar or measure is equal to a semi-breve... The second, where every bar is equal to a minim. a 1763 Byrom Robbery Camb. Coach (R.). Made the red-rugg'd collector's income duple. 1881 W. S. Pratt in Gladden Par. Probl. 460 Duple and quadruple rhythms are the best.

     B. n. A double; = double n. 1. Obs.

1609 Douland Ornith. Microl. 61 You shall find it a Duple. 1650 Bulwer Anthropomet. 63 The proportion of a half part to a duple. 1726 Leoni tr. Alberti's Archit. II. 88/2 Four..the Duple of two. 1787 Sir J. Hawkins Johnson 535 Mathematical ratios of a duple and triple.

II. ˈduple, v. Obs.
    [ad. L. duplāre to double, f. dupl-us duple.]
    trans. To double; to make twice as much or many.

c 1425 Found. St. Bartholomew's (E.E.T.S.) 63 Rehersyng, and duplynge prayers. 1654 Vilvain Epit. Ess. vi. lxxxii, That dupled force. 1694 Holder Harmony (1731) 116 Dupling the Terms of the Ration.

Oxford English Dictionary

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