ordinal number
noun
Forms ordinal numbers
- noun (grammar) A word that expresses the relative position of an item in a sequence. “First, second and third are the ordinal numbers corresponding to one, two and three.”
- noun (arithmetic) A natural number used to denote position in a sequence. “In the expression a₃, the "3" is an ordinal number.”
- noun (set theory) Such a number generalised to correspond to any cardinal number (the size of some set); formally, the order type of some well-ordered set of some cardinality a, which represents an equivalence class of well-ordered sets (exactly those of cardinality a) under the equivalence relation "existence of an order-preserving bijection".
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Antonyms
Sources: Wiktionary · WordNet 3.0 — from the Wiktionary entry “ordinal number”, CC BY-SA 4.0. Details