Midsummer-Day
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
The summer solstice, which is on the 24th day of June, and the feast of St. John the Baptist, a festival first mentioned by Maximus Tauricensis, A. D. 400. It is generally a quarter-day for the payment of rents, etc.
Wharton.