(vehicles) A convertible car: a car with a removable or foldable roof able to convert from a closed to open vehicle and back again.

(finance) A convertible security: a stock, bond, etc. that can be turned into another (usually common stock) under certain set terms.

(computing) A computer able to convert from laptop to tablet and back again.

Able to be converted, exchanged, transformed, or turned to a different purpose or form.