A person who has defected
As soon as Lacey left her childhood home, she became an apostate.
At Modin, Mattathias, an aged priest, not only refused to offer the first sacrifice, but slew an apostate Jew who was about to step into the breach.
Philip became an apostate after his wife died of cancer.
Accordingly he was received into the church by one Berry, himself an apostate, and entered the Jesuit College of Valladolid as Brother Ambrose.
About this time, according to N6ldeke, an anonymous Edessene wrote the Romance of Julian the Apostate, which so many Arab writers use as a history.