πενθήμερος

English (LSJ)

ον,

   A of five days, ἀγών Sch. Pi.O.5.13 ; κατὰ πενθήμερον for alternate periods of five days, X.HG 7.1.14 ; once in every five days, Arist.Ath.30.4 ; also καθ' ἑκάστην πενθήμερον SIG364.9 (Ephesus, iii B. C.).

German (Pape)

[Seite 555] fünftägig, κατὰ πενθήμερον ἑκατέρους ἡγεῖσθαι, Xen. Hell. 7, 1, 14, abwechselnd