Disco is a genre of dance music that originated in the 1970s. It was characterized by a strong beat, electric guitars, and synthesizers. The term 'DISCO' is derived from the French word for 'DISCOTHEQUE, ' which was a nightclub where people would go to dance. The ERA of DISCO was marked by a rise in popularity of the genre, with many hit songs and artists emerging during this time. The crossword solution for the term 'DISCO' is 'ERA, ' which accurately describes the time period in which the genre was popular.