1. The first day of the week, so-called because it was anciently devoted to the worship of the sun; the Christian Sabbath, or Lord's Day.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• sunnyday,
• sindy,
• sanday,
• sudady,
• sunnah,
• saunday,
• sujnday,
• sindey,
• sundya,
• suddan,
• sonday,
• soday,
• sundat,
• sundy,
• subday,
• sundaya,
• stundy,
• launday,
• sundai,
• sundray

• sundew,
• SUND,
• sunde,
• sundae,
• sundt.

The adverb form of the word "Sunday" is "Sundays"

The adjective form of the word "Sunday" is "Sunday".

The plural form of the word "Sunday" is "Sundays"

The singular form of the word "sunday" is "Sunday".