noun

• The seven-day (Reform Judaism) or eight-day (Orthodox and Conservative Judaism) Jewish festival of Pesach, commemorating the biblical story of the Exodus, during which the first-born sons of the Israelites were passed over while those of the Egyptians were killed.
• The one-day Biblical feast or festival (not a holy day) that begins at twilight on the fourteenth day of the first month (Nisan 14), which is then immediately followed by the seven-day Feast of Unleavened Bread (Nisan 15 to 21; the first and seventh days are holy days or annual Sabbaths).
• Alternative letter-case form of Passover [The seven-day (Reform Judaism) or eight-day (Orthodox and Conservative Judaism) Jewish festival of Pesach, commemorating the biblical story of the Exodus, during which the first-born sons of the Israelites were passed over while those of the Egyptians were killed.]