The word 'conversion' originates from Latin 'conversio', meaning 'a turning around' or 'transformation'. It entered English via Old French in the late Middle Ages, retaining the sense of a change or transformation, especially in belief or form.
The act or process of converting; a change from one form, state, or belief to another.
From Old French 'conversion' (14th century), from Latin 'conversionem' (nominative 'conversio'), meaning 'a turning around, transformation', from 'convertere' meaning 'to turn around, transform'. Key roots: vertere (Latin: "to turn"), con- (Latin: "together, with").