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Comprehensive
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cerium a highly reactive chemical element of the rare-earth group that has fifty-eight protons in each nucleus and that occurs naturally only in compounds. (symbol: Ce)
Great Wall of China a defensive wall in northern China which stretches for thousands of miles. Parts of the wall were built as early as the seventh century BCE. These parts were connected to each other and more parts were added on later, especially in the fourteenth through seventeenth centuries CE. Millions of tourists come to see and walk on the Great Wall every year.
millennial a person born near the start of the third millennium CE, especially those born between 1981 and 1996. [1/2 definitions]