ordinal

Adjective
  1. Of or relating to a taxonomic order (synset 303007974)
    "family and ordinal names of animals and plants"
  2. Being or denoting a numerical order in a series (synset 302207704)
    "ordinal numbers"; "held an ordinal rank of seventh"
Noun
  1. The number designating place in an ordered sequence (synset 113618523)

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