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ordinal number
Definition from Dictionary, a free dictionary
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WikipediaNoun
ordinal number ({{{1}}}) (Template loop detected: Template:context 1) A word that expresses the location of an item in an ordered sequence; an ordinal numeral.
 "Third" is an ordinal number, while "three" is a cardinal number.
 (arithmetic) A number used to denote position in a sequence.
 In the expression a_{3}, the "3" is an ordinal number.
 (mathematics) A generalized kind of number to denote the size of a wellordered set.
Translations
number used to denote position in a sequence


generalized kind of number to denote the size of a wellordered set
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Usage notes
On ordinal number usage:
 Ordinal numbers are general construed as adjectives followed by (countable) nouns in singular:
 eleventh day
 Ordinal numbers are used for fractions as (countable) nouns, and for exponents usually followed by power:
 two fifths, <math>\textstyle\frac{2}{5}</math>
 two to the minus twentyfirst power, <math>2^{21}</math>
 six to the third, <math>6^3</math>
 Ordinal numbers are generally considered to be ordered from high to low; so that first place is considered highest, and fifth is lower than second. Degree is an exception.
 Ordinal numbers corresponding to numbers higher that 20 use cardinal numbers for all the places preceding the final ordinal part:
 twentyfirst or 21st, occasionally XXI
 one hundred fifteenth or 115th , occasionally CXV
 thirtythree thousandth or 33,000th
 If an ordinal is followed by a plural noun, the two word phrase refers to a set of items described by the phrase in singular. For example second homes refers to the a set of homes which are considered a "second home."
 Many households have third cars.
See also
 cardinal number
 zeroth
 first
 second
 third (etc)
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