9 11
[nahyn–i-lev-uh n] /ˈnaɪn ɪˈlɛv ən/
september 11, 2001: the day on which islamic terrorists, believed to be part of the al-qaeda network, hijacked four commercial airplanes and crashed two of them into the world trade center in new york city and a third one into the pentagon in virginia: the fourth plane crashed into a field in rural pennsylvania.
also, 9-11.
also called nine-eleven.
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