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From: Webster's Revised Unabridged Dictionary (1913)

 Ses·qui·al·ter·al Ses·qui·al·ter·ate a.  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.