'ordinal' definitions:

Definition of 'ordinal'

From: WordNet
adjective
Of or relating to a taxonomic order; "family and ordinal names of animals and plants"
adjective
Being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh" [ant: cardinal]
noun
The number designating place in an ordered sequence [syn: ordinal number, ordinal, no.]