mitre (Noun) — Joint that forms a corner; usually both sides are bevelled at a 45-degree angle to form a 90-degree corner.
mitre (Noun) — The surface of a bevelled end of a piece where a mitre joint is made. ex. "he covered the mitre with glue before making the joint"
mitre (Noun) — A liturgical headdress worn by bishops on formal occasions.
mitre (Verb) — Bevel the edges of, to make a mitre joint.
mitre (Verb) — Confer a mitre on (a bishop).
mitre (Verb) — Fit together in a mitre joint.