Sunday sunday • sunday best · · · Info · Definitions · Characters · · Sunday · · Text Latin · · Script 6 · · Length 2 · · Syllables Definitions · · · (noun) first day of the week; observed as a day of rest and worship by most Christians. Synonyms: Lord's Day, Dominicus, Sun. · · Noun Definition 1 (noun) United States evangelist (1862-1935). Synonyms: Billy Sunday, William Ashley Sunday. · · Noun Definition 2 Characters · · S latin capital letter s U+0053 a latin small letter a U+0061 d latin small letter d U+0064 n latin small letter n U+006E u latin small letter u U+0075 y latin small letter y U+0079