My pastor who was an excellent Greek scholar showed us that its the same word derivative was used for when Satan
departed from Jesus after failing in the temptation. Luke 4:13
And....
The Latin Vulgate Bible, around AD400, used the word decessio, which means “departure.” Seven English translations, from the Wycliffe Bible of 1384 to the Geneva Bible of 1608, all translated the word as departure or departing. The King James Bible of 1611 was the first English version to translate apostasia as “falling away.”
That link has much good information!