noun: the hours between 5pm and 7pm when an Edwardian lady dressed for dinner.
also: a euphism for the liaison that a lady’s lover would conduct with her during the preprandial hours. These hours were chosen for the practical constraint of the time it took an Edwardian woman to dis-and rerobe.
ALSO: a swanky club for “swinging” married couples where late 19th century attire is required for admittance.
OR: a couturier of impossibly complicated lingerie.