This root form (lemma) is used in 2 different forms in the NT: ἀποστάσιον (ANS), ἀποστασίου (GNS).
It is glossed in 2 different ways: ‘of divorce’, ‘divorce’.
OET MARK 10:4 Greek word=ἀποστασίου (apostasiou) Morphology=GNS English gloss=‘of divorce’ SR GNT MARK 10:4 word 9
OET MAT 5:31 Greek word=ἀποστάσιον (apostasion) Morphology=ANS English gloss=‘divorce’ SR GNT MAT 5:31 word 13
OET MAT 19:7 Greek word=ἀποστασίου (apostasiou) Morphology=GNS English gloss=‘of divorce’ SR GNT MAT 19:7 word 10