..Easter,^1] also called Pascha^[] (Aramaic, Greek, Latin) or Resurrection Sunday,^{[nb 3]} is a Christian festival and cultural holiday commemorating the resurrection of Jesus from the dead, described in the New Testament as having occurred on the third day of his burial following his crucifixion by the Romans at Calvary c. 30 AD.^[12][13] It is the culmination of the Passion of Jesus, preceded by Lent (or Great Lent), a 40-day period of fasting, prayer, and penance.

Easter-observing Christians commonly refer to the week before Easter as Holy Week, which in Western Christianity begins on Palm Sunday (marking the entrance of Jesus in Jerusalem), includes Spy Wednesday (on which the betrayal of Jesus is mourned),^[14] and contains the days of the Easter Triduum including Maundy Thursday, commemorating the Maundy and Last Supper,^[] as well as Good Friday, commemorating the crucifixion and death of Jesus.^[17] In Eastern Christianity, the same events are commemorated with the names of days all starting with "Holy" or "Holy and Great", and Easter itself might be called Great and Holy Pascha. In both Western and Eastern Christianity, Eastertide, the Easter or Paschal season, begins on Easter Sunday and lasts seven weeks, ending with the coming of the 50th day, Pentecost Sunday, but in Eastern Christianity the leavetaking of the feast is on the 39th day, the day before the Feast of the Ascension.

Easter and its related holidays are moveable feasts, not falling on a fixed date; its date is computed based on a lunisolar calendar (solar year plus Moon phase) similar to the Hebrew calendar, generating a number of controversies. The First Council of Nicaea (325) established common Paschal observance by all Christians on the first Sunday after the first full moon on or after the vernal equinox.^[] Even if calculated on the basis of the Gregorian calendar, the date of that full moon sometimes differs from that of the astronomical first full moon after the March equinox.^[]

.復活節（拉丁語：Pascha；英語：Easter），又稱主復活日，是基督宗教的重要節日之一，紀念耶穌基督於公元30/33年被釘死後第三天復活的事蹟。復活節最初與猶太人的逾越節同日，但教會在4世紀第一次尼西亞公會議決議不用猶太曆，於是改定為每年春分月圓之後第一個星期日。 目前是北半球春分月圓後的第一個星期日（南半球實則是秋分），如果月圓那天剛好是星期天，復活節則延後一星期，因此復活節可能在從3月22日到4月25日之間的任何一天。復活節是基督信仰的高峰，因此被基督徒認為象徵著永生與赦罪；不過現今許多與復活節相關的民間風俗，都不起源於基督宗教。