An apostate.
To undergo a deconversion from a religion, faith or belief or (transitive) to induce (someone) to reject a particular religion, faith, or belief.
She has deconverted from Christianity, Islam, Judaism, etc.
To revert or (transitive) to restore.
We must arrange to deconvert chartered vessels if the owner so desires. He may want them put back in the same condition as when chartered.
From de- + convert.
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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.