ordinal number
noun
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- (grammar) A word that expresses the relative position of an item in a sequence.
- (arithmetic) A natural number used to denote position in a sequence.
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序数,
序数詞
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- (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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序数,
序数詞,
順序数
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