ordinal

Etymology

Borrowed from Latin ōrdinālis, adjective formed from noun ōrdō (“order”), + adjective suffix -ālis.

adj

1. (mathematics, of a number) Indicating position in a sequence.
2. (taxonomy) Pertaining to a taxon at the rank of order.
3. (nautical) Intercardinal.

noun

1. An ordinal number such as first, second and third.
   The most common numerals in Latin, as in English, are the "cardinals"[…]and the "ordinals"[…] 2005, F. M. Wheelock, Wheelock’s Latin, 6th revised edition, page 97
2. A book used in the ordination of Anglican ministers, or in certain Roman Catholic services