MI'TER, noun

1. A sacerdotal ornament worn on the head by bishops and certain abbots, on solemn occasions.

2. In architecture, an angle of 45 degrees.

3. In Irish history, a sort of base money or coin.

4. Figuratively, the dignity of bishops or abbots.

MI'TER, verb transitive To adorn with a miter

1. To unite at an angle of 45 degrees.