{ Ses′qui‐al″ter‐al (?), Ses′qui‐al″ter‐ate (?), } a. [L. sesquialter once and a half; sesqui- + alter other: cf. F. sesquialtére.] Once and a half times as great as another; having the ratio of one and a half to one.
Sesquialteral ratio(Math.), the ratio of one and a half to one; thus, 9 and 6 are in a sesquialteral ratio.