Strong’s Greek
G647 — apostasion
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀποστάσιον
apostasion — pronounced ap-os-tas'-ee-on
neuter of a (presumed) adjective from a derivative of 868; properly, something separative, i.e. (specially) divorce:--(writing of) divorcement. see GREEK for 868
3 occurrences in the KJV.
Matthew 5:31
It hath been said, Whosoever shall put away his wife, let him give her a writing of divorcement:
Matthew 19:7
They say unto him, Why did Moses then command to give a writing of divorcement, and to put her away?
Mark 10:4
And they said, Moses suffered to write a bill of divorcement, and to put her away.