διπλασιεπιδίτριτος
From LSJ
τὸ πλῆθος οὐκ εὐαρίθμητον ἦν → the crowd wasn't easy to count, the crowd was not small, it was not a small crowd
English (LSJ)
διπλασιεπιδίτριτον, ibid., Domnin. in Rev.Phil.7.90, 2⅔ times as great.
Spanish (DGE)
-ον
de proporción 2⅔ Nicom.Ar.1.23, Domn.Prop.12, 16.
German (Pape)
2⅔mal so groß, Nicom. inst.arithm. 1.23.