- Sesquiplicate Ses*quip"li*cate, a. [Sesqui- + plicate.]
Subduplicate of the triplicate; -- a term applied to ratios;
thus, a and a' are in the sesquiplicate ratio of b and b',
when a is to a' as the square root of the cube of b is to the
square root of the cube of b', or
The Collaborative International Dictionary of English. 2000.