dūˈplicative adjective

dūˈplicātor noun

A copying machine

dūˈplicāture noun

1. A doubling
2. Anything doubled
3. The fold of a membrane

dūplyˈ noun

A second reply in Scots law

To say in duply

duplicate bridge noun

A form of competition bridge in which each pair or four plays the same set of hands as all other pairs or fours

duplicate ratio noun

Ratio of the squares of the quantities

duplication of the cube

The problem eagerly discussed by the early Greek geometers, of constructing a cube equal to twice a given cube, impossible by use of straight line and circle only, but soluble by means of other curves

in duplicate

In two copies, or original accompanied by a copy