κέντρωσις
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)
εως, ἡ,
A goading, piercing, Sch.Pi.P.1.54. II Astron., situation at cardinal point, Ptol.Tetr.79, 99.
German (Pape)
[Seite 1419] ἡ, das Stacheln, Anspornen; Schol. Pind. P. 1, 28 u. a. Sp.; das im Centrum Stehen, Procl.