9-11
Definition
Proper noun A specific date referring to September 11, 2001, on which a series of coordinated terrorist attacks occurred in the United States, involving the hijacking of commercial airliners.
Usage
This term is used as a singular proper noun to refer specifically to the events of that day. It is often written with a hyphen (9-11) or as "9/11". It functions as a point in time and the associated historical event.
Examples
- The world changed after 9-11.
- Security measures in airports were drastically increased following 9-11.
- Many documentaries examine the causes and consequences of 9-11.
Advanced Usage
- "post-9-11 world": Used as an adjective to describe the period, policies, or cultural atmosphere after the attacks.
- Air travel in the post-9-11 world involves much stricter security.
Variants and Related Words
- 9/11: The more common written variant, using a slash instead of a hyphen.
- September 11 attacks: A more formal and descriptive term for the same event.
- 9/11 attacks: A common hybrid term.
Synonyms
- September 11th
- The September 11 attacks
Notes
This term is highly specific and context-dependent. It almost exclusively refers to the terrorist attacks in the United States in 2001 and is not used for other events that happened on that calendar date.
Noun
-
the day in 2001 when Arab suicide bombers hijacked United States airliners and used them as bombs
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