"ordinal" in the noun sense
1. ordinal number, ordinal, no.
the number designating place in an ordered sequence
"ordinal" in the adjective sense
1. ordinal
of or relating to a taxonomic order
"family and ordinal names of animals and plants"
2. ordinal
being or denoting a numerical order in a series
"ordinal numbers"
"held an ordinal rank of seventh"
Source: WordNet® (An amazing lexical database of English)
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