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a.1.(Math.) Having the ratio of one and one third to one (as 4 : 3).
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Then the union of single and double emerges in one to two (1:2); the sesquialter union in two and three (2:3); and the sesquitertian in three and four (34).