(ôr′də·nəl) adjective
1. Denoting position in an order or succession.
2. Pertaining to an order, as of plants, animals, etc.
—noun An ordinal number. See under NUMBER. [<LL ordinalis <L, ordo, -inis an order]

(ôr′də·nəl) noun Eccl.
1. A book of rites for clerical ordinations, episcopal consecrations, etc.
2. An ordo. [<Med. L ordinale <LL ordinalis. See ORDINAL¹.]