Definitions

1. noun

Prejudice or bias against people who do not observe the Christian Sabbath on Sundays, or who observe it on another day.

“The community was accused of sundayism for not welcoming the Jewish family to join their Sunday services.”

2. noun

A doctrine or practice that observes Sunday as a day of rest, in opposition to the seventh-day Sabbath.

“The seventh-day Adventist community rejected the sundayism of the local churches that celebrated on Sundays.”