## Definitions for ordinal number

### Princeton's WordNet(0.00 / 0 votes)Rate this definition:

1. ordinal number, ordinal, no.(noun)

the number designating place in an ordered sequence

### Wiktionary(5.00 / 1 vote)Rate this definition:

1. ordinal number(Noun)

A word that expresses the relative position of an item in an ordered sequence.

2. ordinal number(Noun)

A number used to denote position in a sequence.

3. ordinal number(Noun)

A generalized kind of number to denote the size of a well-ordered set.

### Freebase(0.00 / 0 votes)Rate this definition:

1. Ordinal number

In set theory, an ordinal number, or just ordinal, is the order type of a well-ordered set. They are usually identified with hereditarily transitive sets. Ordinals are an extension of the natural numbers different from integers and from cardinals. Like other kinds of numbers, ordinals can be added, multiplied, and exponentiated. Ordinals were introduced by Georg Cantor in 1883 to accommodate infinite sequences and to classify sets with certain kinds of order structures on them. He derived them by accident while working on a problem concerning trigonometric series—see Georg Cantor. Two sets S and S' have the same cardinality if there is a bijection between them If a partial order < is defined on set S, and a partial order

### Numerology

1. Chaldean Numerology

The numerical value of ordinal number in Chaldean Numerology is: 2

2. Pythagorean Numerology

The numerical value of ordinal number in Pythagorean Numerology is: 2

# Translations for ordinal number

### From our Multilingual Translation Dictionary

• ordinální číslo
• järjestysluku, ordinaaliluku, ordinaali
• rendszám
• 順序数
• ranggetal
• liczebnik porządkowy
• số thứ tự

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"ordinal number." Definitions.net. STANDS4 LLC, 2017. Web. 19 Oct. 2017. <http://www.definitions.net/definition/ordinal number>.