Usage: 3 forms in 3 verses
Form Translated As     In Verse(s)
αφορισμών of your offerings LXX.Ezek.20.40
αφορισμού offering LXX.Ezek.48.8
αφορισμοίσ your offerings LXX.Ezek.20.31

Liddell-Scott-Jones

ἀφορισμός (aphorismos) an offering G:N-M

ἀφορισμός-ισμός, ,

delimitation, assignment of boundaries, [Refs 4th c.AD+]; θέσεως[Refs 6th c.AD+]

__II separation, distinction, [LXX+4th c.BC+]: hence, banishment, = Latin relegatio, [Refs 6th c.AD+]
__II.2 determination, [Refs 4th c.BC+]
__II.3 attainment of definiteness, [Refs 4th c.BC+]; distinctive character or feature, [Refs 3rd c.AD+]
__II.4 pithy sentence, aphorism (such as those of [Refs 5th c.BC+]
__II.5 fixed rule, [Refs 4th c.BC+]

LSJ Scripture Refs: LXX.Isa.56.3