A generalized kind of number used to denote the size of a set, including infinite sets.
A word that expresses a countable quantity; a cardinal numeral.
A number used to denote quantity; a counting number; a cardinal.
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".
A natural number used to denote position in a sequence.
A word that expresses the relative position of an item in a sequence.