ridotto
A public ball, typically a masquerade, popular in the 18th century.
historical
There are to be ridottos at guinea tickets.
May 26, 1742, Horace Walpole, letter to Horace MannAn arrangement or abridgment of a piece from the full score.
Where it comes from
Borrowed from Italian ridotto (“foyer”). Doublet of redoubt.
Adapted from the Wiktionary entry ridotto (CC BY-SA 4.0).