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The Collaborative International Dictionary
Sesquiduplicate ratio

Sesquiduplicate \Ses`qui*du"pli*cate\, a. [Sesqui- + duplicate.] 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.