Thirteen is a cardinal number and noun used to indicate the value 13. It can function as a count noun or as an attributive modifier (as in “thirteen students”). It’s typically stressed on the first syllable and pronounced with two syllables: /ˈθɜːrˌtiːn/ in General American; some varieties reduce the /ɜːr/ to /ɜːr/ or /ɜr/ and fuse sounds in rapid speech.
Full pronunciation guide
