One of the mysteries of the English language finally explained.
Designating a Sabbath observed on the first day of the week (Sunday); designating a Christian denomination, or a member of one, that observes the Sabbath on this day. Usually contrasted with observance of the Sabbath on the seventh day: compare "seventh-day". Now historical.
In the Religious Society of Friends (Quakers): (a name for) Sunday, as being the first day of the week.
Mid 17th century; earliest use found in George Abbot (1562–1633), archbishop of Canterbury. From first + day.
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