Definition of "justiciar"

(historical) One who administers justice, particularly:

1. (historical) A high-ranking judicial officer of medieval England or Scotland.

2. (historical) A justice: a high-ranking judge.

3. (historical) A Chief Justiciar: the highest political and judicial officer of the Kingdom of England in the 12th and 13th centuries.

4. (historical) Various equivalent medieval offices elsewhere in Europe.

(Christianity, theology, rare) A justiciary: a believer in the doctrine (or heresy) that adherence to religious law redeems mankind before God.