Sabbatarian

[ sab-uh-tair-ee-uh n ]

/ ˌsæb əˈtɛər i ən /

a person who observes the seventh day of the week, Saturday, as the Sabbath.

a person who adheres to or favors a strict observance of Sunday.

of or relating to the Sabbath and its observance.

Origin of Sabbatarian

1605–15; < Late Latin sabbatāri(us) ( sabbat(um) Sabbath + -ārius -ary) + -an

Sab·ba·tar·i·an·ism, noun

The rigid strictness of Sabbatarian practice requires the full energy of middle life.

The Prime Minister |Anthony Trollope
It will become a feature in our Sabbatarian domesticity some day, and among railway journeys at the present time it is unique.

The Siege of Mafeking (1900) |J. Angus Hamilton.
Ryper shooting began by law yesterday, but our Sabbatarian proclivities prevented us from going forth to the chase.

Three in Norway |James Arthur Lees
Old Duncan is the strictest Sabbatarian in the island, but on Monday he's worth keeping an eye on.

Literary Tours in The Highlands and Islands of Scotland |Daniel Turner Holmes

Certainly, the inconsistencies of Sabbatarian practice, as I remember them, were no greater than they are now.

The Retrospect |Ada Cambridge

Sabbatarian

/ (ˌsæbəˈtɛərɪən) /

a person advocating the strict religious observance of Sunday

a person who observes Saturday as the Sabbath

of or relating to the Sabbath or its observance

Sabbatarianism, noun

C17: from Late Latin sabbatārius a Sabbath-keeper