Sunday: Meaning and Definition of

Sun•day

1. the first day of the week, observed as the Sabbath by most Christian sects.
2. an indeterminately great length of time: She hadn't taken a vacation in a month of Sundays.

1. of, pertaining to, or characteristic of Sunday.
2. used, done, taking place, or being as indicated only on or as if on Sundays: a Sunday matinée.

Sun•day

1. (“Billy Sunday”), 1862–1935, U.S. evangelist.
2. a female given name.