a person who renounces a religious or political belief or principle
(宗教信仰、政治信仰或原则的)背弃者,背叛者;变节者。
abandoning a religious or political belief or principle
背弃 (宗教信仰、政治信仰或原则)的,背叛的;变节的
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an apostate Roman Catholic. 罗马天主教的背叛者。
 
"Middle English:  from ecclesiastical Latin