From Longman Dictionary of Contemporary Englishthirteenthir‧teen /ˌθɜːˈtiːn◂ $ ˌθɜːr-/ ●●● S3 W3 number HMNthe number 13 They’ve only sold thirteen tickets so far. When it happened, I was thirteen (=13 years old). —thirteenth adjective, pronoun It’s Roberto’s thirteenth birthday. the thirteenth century
Examples from the Corpus
thirteen• Mohandas Karamchand Gandhi married at the age of thirteen when he was a high school sophomore.Origin thirteen Old English threotiene, from thrie, threo “three” + tien “ten” 