**Ses*quip"li*cate** (?), a. [*Sesqui-* + *plicate*.] Math.

Subduplicate of the triplicate; -- a term applied to ratios; thus, *a* and *a�xb7;* are in the *sesquiplicate* ratio of *b* and *b�xb7;*, when *a* is to *a�xb7;* as the square root of the cube of *b* is to the square root of the cube of *b�xb7;*, or a:a�xb7;::&root;b3:&root;b�xb7;3.

The periodic times of the planets are in the **sesquiplicate** ratio of their mean distances.
*Sir I. Newton.*

© Webster 1913.