sabbatharian

Noun

Sabbatarian (plural Sabbatarians)

1. A person who regards and keeps the seventh day of the week ("Saturday", the Israelite or Jewish Sabbath) as holy in conformity with the fourth commandment of the Decalogue, such as an Orthodox Jew, Seventh-day Adventist, Seventh Day Baptist, a member of the Church of God (Seventh Day); a Sabbath-keeper, a Saturday-keeper.
2. A person who regards and keeps the first day of the week as holy and often considers it as a replacement for the seventh-day Sabbath, a Sunday-keeper.
   • During the sixties [1860s] the Sabbatarians were particularly active in their attacks on Sunday excursions, and this had an effect both on the companies and the public.1954 June, R. Marchant, “Early Excursion Trains”, in Railway Magazine, page 427
3. A person who favors the strict observance of the Sabbath (either the sixth, seventh, or first day of the week).
4. A member of a non-Jewish religious sect originating in Russia distinguished by observance of Jewish rites and festivals including Saturday as the day of rest.

See all 5 meanings of sabbatarian