thirteen is one of the 1000 most common headwords.
think - thirteen - thirty
English numbers (edit)
 ←  12 13 14  → 
    Cardinal: thirteen
    Ordinal: thirteenth

Pronunciation change

Determiner change

Determiner
thirteen

  1. (number) (indefinite) (plural) (count) (ordinal thirteenth) Thirteen is the number that is after twelve and before fourteen. In numerals, it is 13.
    Thirteen donuts makes a baker's dozen.
    The thirteen are never alone.

Noun change

Singular
thirteen

Plural
thirteens

  1. The number 13.
    Three and ten makes thirteen.

Adjective change

Positive
thirteen

Comparative
none

Superlative
none

  1. To be thirteen years old.
    This girl is thirteen.