Sesquialteral

ses-kwi-al′te-ral, adj. one and a half more—also Sesquial′terate , Sesquial′terous .— n. Sesquial′tera ( mus. ), the interval of a perfect fifth, having the ratio of 2 to 3: a rhythm in which three minims are made equal to a preceding two. [L. sesquialter .]