Usage: 5 forms in 18 verses
Form Translated As     In Verse(s)
εβδομάσ period of sevens LXX.Dan.9.27
εβδομάδων of a period of sevens LXX.Exod.34.22
of period of sevens LXX.Deut.16.10
period of sevens LXX.Num.28.26LXX.Deut.16.16LXX.2Chr.8.13LXX.Dan.10.3
εβδομάδοσ period of seven LXX.Lev.23.16LXX.Dan.9.27
εβδομάδεσ periods of seven LXX.Lev.25.8LXX.Dan.9.24LXX.Dan.9.25LXX.Dan.9.25
εβδομάδασ periods of seven LXX.Lev.23.15LXX.Deut.16.9LXX.Deut.16.9LXX.Dan.9.26LXX.Dan.10.2

Liddell-Scott-Jones

ἑβδομάς (hebdomas) a period of seven G:N-F

ἑβδομάς-άς, άδος, ,

the number seven, [Refs 1st c.AD+]

__II a number of seven, [Refs]
__II.2 period of seven days, week, [LXX+5th c.BC+]
__II.2.b period of seven years, [Refs 6th c.BC+]

LSJ Scripture Refs: LXX.Exod.34.22