(Catholicism) A feast day on which the faithful are expected to attend Mass.

plural of holy day of obligation

Any organization that wastes time on bureaucracy to the detriment of its actual business.

plural of circumlocution office

(transitive) To draw from a cask and put into bottles.

plural of right of asylum

(law) The right of a person persecuted by his or her own country to be protected by another sovereign authority.

(medicine) The level of suspicion that a disease or condition is the underlying diagnosis based on the available findings in a patient.

(poetic) Thailand

(poetic) The oak tree.