I. ˌsa-bə-ˈter-ē-ən noun
Etymology: Latin sabbatarius, from sabbatum sabbath
Date: 1613
1. : one who observes the Sabbath on Saturday in conformity with the letter of the fourth commandment
2. : an adherent of Sabbatarianism
II. adjective
Date: circa 1631
1. : of or relating to the Sabbath
2. : of or relating to the Sabbatarians or Sabbatarianism