- a Jewish high holy day observed on the 10th day of the month of Tishri by abstinence from food and drink and by the daylong recitation of prayers of repentance in the synagogue.
- an annual Jewish holiday celebrated on Tishri 10 as a day of fasting, on which prayers of penitence are recited in the synagogue throughout the dayAlso called: Day of Atonement
Jewish holiday, 1854, from Mishnaic Hebrew yom kippur (in Biblical Hebrew, yom kippurim), literally “day of atonement,” from yom “day” + kippur “atonement, expiation.” In Judaism, the Day of Atonement, the most important religious holiday; a day of fasting to atone for sins. It comes in autumn. (See Rosh Hashanah.)