The first day of the week in many religious traditions, and the seventh day of the week in systems using the ISO 8601 standard; the ChristianSabbath; the Lord's Day; it follows Saturday and precedes Monday.
From Middle English Sonday, from Old English sunnandæġ ("day of the sun"), from sunne, + dæġ, from Proto-West Germanic *sunnōn dag, as a translation (interpretātiō germānica) of Latin diēs Sōlis; declared the "venerable day of the sun" by Roman Emperor Constantine on March 7, 321 .
Compare Saterland Frisian Sundai ("Sunday"), German Low German Sünndag, Dutch zondag, West Frisian snein, German Sonntag, Danish søndag.
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