9-11

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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
  1. the day in 2001 when Arab suicide bombers hijacked United States airliners and used them as bombs

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