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Centennial A period of 100 years, often commemorated by grand celebrations and other festivities. ■ "The United States celebrated its centennial in 1976 with fireworks, parades, and a new coin featuring George Washington."
Rotunda A building with a large, round dome at the top. ■ "The Washington Monument is a rotunda made of marble and stands 555 feet tall."
presidents A group of highly respected and powerful leaders who have been elected by the people to lead a country. ■ "The presidents of the United States are known for their great leadership skills, but they also have a sense of humor. For example, President George Washington loved telling jokes, while President Abraham Lincoln was known for his witty sayings."