The day of the week before Monday and following Saturday, observed by Christians as a day of rest and religious worship and (together with Saturday) forming part of the weekend. Recorded in Old English as Sunnandæg ‘day of the sun’, the name is a translation of Latin dies solis.
Sunday school a class held on Sundays to teach children about Christianity; such schools are now intended only for religious instruction, but originally also taught some secular subjects.
Sunday's child a child born on Sunday, traditionally greatly blessed or favoured; the belief is the culmination of the traditional rhyme Monday's child is fair of face.
See also Care Sunday at care, Egg Sunday at egg, a month of Sundays, Stir-up Sunday at stir.