The Twenties, also known as the Roaring Twenties, was a DECADE in the 20th century that began on January 1, 1920 and ended on December 31, 1929. It is often referred to as the 'Jazz Age' due to the popularity of jazz music during this time. The Twenties were a period of economic prosperity and social change, with many advances in technology, science, and culture. The answer to the crossword puzzle is DECADE, which accurately describes the Twenties as a ten-year period of time.