spec. Christian Church. Frequently with capital initial. Accepting, espousing, or characterized by the principles of the Reformation.

Frequently with capital initial. Of or relating to the Reformation.

Of, relating to, or concerned with religious or church reform; esp. (usually with capital initial) of, belonging to, or characteristic of the…

Of or relating to the Reformation or its supporters; (more generally) that supports or advocates reform, reformist.