What is "deconvert"

n. An apostate. vb. 1 (context intransitive English) To undergo a deconversion from a religion, faith or belief or (qualifier: transitive) to induce (someone) to reject a particular religion, faith, or belief. 2 (context intransitive English) To revert or (qualifier: transitive) to restore. 3 (context transitive English) 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.