Ordinal numbers

An ordinal number is a number used to tell order, or position. Each ordinal number can be paired with a cardinal number (a whole number that tells how many are in a group.)


Ordinal number   Cardinal number
first   one, or 1
second   two, or 2
third   three, or 3
fourth   four, or 4
tenth   ten, or 10
twenty-first   twenty-one, or 21
hundredth   one hundred, or 100

Related word order.

See also cardinal numbers.