sesquĭ-alter, ĕra, ĕrum, adj.,
once and a half (ἐπιδεύτερος), Cic. Univ. 7, 20 sqq.; Vitr. 3, 1 med. ; Ap. Mag. p. 330 med.
sēsqui-alter era, erum, adj.,once and a half: tertia pars, secundae sesquialtera. ...
An Elementary Latin Dictionary
·adj <<Sesquialteral>>. II. Sesquialter ·noun ·Alt. of <<Sesquialtera>>. ...
Webster's Dictionary of the English Language