Ses·quip·li·cate a. Math. 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 a:a´::√b³:√b´³.
The periodic times of the planets are in the sesquiplicate ratio of their mean distances. --Sir I. Newton.
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