The term 'Slow Symphonic Movement' refers to a type of musical composition that is characterized by a slow tempo and a symphonic structure. The term is often used to describe pieces of classical music, such as those composed by Mozart or Beethoven. The crossword solution for this term is 'ADAGIO, ' which is an Italian musical term meaning 'at a slow tempo.' ADAGIO is often used to describe a slow and graceful musical movement, and is commonly associated with classical music.