Sabbatarianism - Definition and Overview

Sabbatarianism can refer to either:

The practice of observing the seventh day (Friday's sunset to Saturday's sunset) as the Sabbath. By this definition Jews, Seventh-day Adventists, and Seventh Day Baptists are sabbatarians.
Strict observance of the Sabbath, regardless of what day is observed. By this definition most conservative Christians and Jews are sabbatarians.

See also