Sun″day (?), n. [AS. sunnandæg; sunne, gen. sunnan, the sun + dæg day; akin to D. zondag, G. sonntag; — so called because this day was anciently dedicated to the sun, or to its worship. See Sun, and Day.] The first day of the week, — consecrated among Christians to rest from secular employments, and to religious worship; the Christian Sabbath; the Lord's Day.
Advent Sunday, Low Sunday, Passion Sunday, etc. See under Advent, Low, etc.
Syn. — See Sabbath.