divertimento
Concise Oxford English Dictionary © 2008 Oxford University Press:
divertimento /dɪˌvəːtɪˈmɛntəʊ, -ˌvɛːt-/
▶noun (pl. divertimenti /-ti/ or divertimentos) Music a light and entertaining composition, typically in the form of a suite for chamber orchestra.
– origin C18: Ital., lit. ‘diversion’.
'divertimento' also found in these Oxford entries:

