American English

Definition of seventeen number from the Oxford Advanced American Dictionary

 

seventeen

 number
number
NAmE//ˌsɛvnˈtin//
 
 
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17
seventeenth
 
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NAmE//ˌsɛvnˈtinθ//
 
ordinal number, noun There are examples of how to use ordinal numbers at the entry for fifth.
See the Oxford Advanced Learner's Dictionary entry: seventeen