: a musical work performed between the acts of a play or opera in Italy from the late 15th century through the 17th century including instrumental music and sometimes singing and dancing
The 1589 intermedii had already included a representation of Mount Helicon, complete with Pegasus on top (second intermedio) and a seascape with Tritons and other sea creatures (fifth intermedio).—Massimo Ossi, in Opera in Context, 1998