Definition: ordinal

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Source: WordNet (r) 1.7 

ordinal
     adj 1: of or relating to a taxonomic order; "family and ordinal
            names of animals and plants"
     2: being or denoting a numerical order in a series; "ordinal
        numbers"; "held an ordinal rank of seventh" [ant: cardinal]
     n : the number designating place in an ordered sequence [syn: ordinal
         number, no.]

Source: Webster's Revised Unabridged Dictionary (1913) 

Ordinal \Or"di*nal\, a. [L. ordinalis, fr. ordo, ordinis, order.
   See Order.]
   1. Indicating order or succession; as, the ordinal numbers,
      first, second, third, etc.

   2. Of or pertaining to an order.
Ordinal \Or"di*nal\, n.
   1. A word or number denoting order or succession.

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

   3. (R. C. Ch.) A book containing the rubrics of the Mass.
      [Written also ordinale.]

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

ordinal

   <mathematics> An isomorphism class of well-ordered sets.

   (1995-03-10)