Ordinal \Or"di*nal\, n. 1. A word or number denoting order or succession. [1913 Webster] 2. (Ch. of Eng.) The book of forms for making, ordaining, and consecrating bishops, priests, and deacons. [1913 Webster] 3. (R. C. Ch.) A book containing the rubrics of the Mass. [Written also {ordinale}.] [1913 Webster]