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n. An apostate.

v. To undergo a deconversion from a religion, faith or belief or (transitive) to induce (someone) to reject a particular religion, faith, or belief.

v. To revert or (transitive) to restore.

v. To change a building that has been converted to a new use back to its original use; specifically to change a house that has been converted into apartments or flats back to a single-family dwelling.

"I have read a great deal by ex-Christian Agnostics and Atheists, and so have the impression that for many who deconvert, that is the case."