Tiananmen Square

American Heritage® Dictionary of the English Language, Fourth Edition

1. An extensive open area in central Beijing, China, the world's largest public square. Adjacent to the Forbidden City, it has long been the site of festivals, rallies, and demonstrations. In 1989 Chinese troops fired on student demonstrators, killing an estimated 2,000 or more.

Wiktionary

1. n. A large plaza in Beijing, China.
2. n. A protest event held in the square on June 4, 1989.