(1):

(n.) The book of forms for making, ordaining, and consecrating bishops, priests, and deacons.

(2):

(n.) A book containing the rubrics of the Mass.

(3):

(a.) Of or pertaining to an order.

(4):

(a.) Indicating order or succession; as, the ordinal numbers, first, second, third, etc.

(5):

(n.) A word or number denoting order or succession.