The middle of the night: the sixth temporal hour, equidistant between sunset and sunrise.
Twelve o'clock at night exactly.
Synonym of boxcars (“a pair of sixes”)
Utterly dark or black.
The ninth hour after dawn (about 3 pm).
The notional first-quarter day of a Roman month, occurring on the 7th day of the four original 31-day months (March, May, Quintilis or July, and October) and on the 5th day of all other months.
The divine office appointed to the hour.