Abba refers to a Swedish pop band formed in 1972. They gained international success and are known for their catchy songs and unique harmonies. The word "abba" itself does not have a specific definition outside of referring to the band.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: "Take a Chance on Me" group. Explanations are generated by AI and may be inaccurate.