Sesquiduplicate

Ses`qui`du´pli`cate


a.1.Twice and a half as great (as another thing); having the ratio of two and a half to one.
Sesquiduplicate ratio
(Math.) the ratio of two and a half to one, or one in which the greater term contains the lesser twice and a half, as that of 50 to 20.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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