9/11


Meaning of 9/11 in English

9/11 /ˌnaɪn ɪˈlev ə n/ BrE AmE noun [uncountable] especially American English

September 11, 2001, when TERRORISTS used planes to attack New York and Washington:

the terrifying events of 9/11

a 9/11 disaster relief fund

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.