SUBDUPLE

Source: 566, 567

subduple. Subduple, a. half, one out of two

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Sub″du‐ple (?), a. (Math.) Indicating one part of two; in the ratio of one to two. Subduple ratio, the ratio of 1 to 2: thus, 3:6 is a subduple ratio, as 6:3 is a duple ratio.