ἀποστάσιον/apostasion

This word is a type of thing or idea. It is a noun.

This word can mean divorce. This is the action of a man who ends his marriage and sends his wife away.
This word can mean the document that a man writes and gives to his wife when he wants to divorce her. When he gives her the document, the marriage ends.

See: Matthew 5:31; 19:7; Mark 10:4