Transclass, class transitioner, class defector, or social defector refers to an individual who has experienced a major change in social environment during their lifetime. The concept of transclass was coined by the French philosopher Chantal Jaquet. In the English translation of her work, Gregory Elliot employs the term class-passing instead of defection. Similarly, the German translation by Horst Brühmann established the term "class passer" in this context.