This would be the correct way of addressing the head of an abbey. The original meaning of ‘abbot’ was ‘father’, so the expression is tautological. ‘Abbot’ is sometimes used on its own in direct address. In Henry the...

An abbot who has been an altar boy knows well who drinks the altar wine....

The word abbot, meaning father, is a title given to the head of a monastery in various traditions, including Christianity and Buddhism. The office may also be given as an honorary title to a clergyman who is not actually the head of a monastery. The...