What is the meaning of High_priest?

A clergyman with a higher function than a normal priest.

In the Bible, the male individual who was responsible for making the annual sacrifice on the Day of Atonement (Yom Kippur); always a descendant of Aaron, the older brother of Moses.

Jesus Christ.

The second-lowest office in the Melchizedek priesthood.

A person holding a position of power or influence; an authority in a field of study, doctrine, art or a movement.

A second or third degree male witch in Wicca.

Source: wiktionary.org