In Christianity, the week that begins with Palm Sunday and concludes with Easter Sunday. Palm Sunday commemorates Jesus’ triumphal entry into Jerusalem, and Easter commemorates his rising from the dead. Also includes Holy Thursday, which commemorates the Last Supper (Jesus’ final meal with his disciples), and Good Friday, the day of Christ’s Crucifixion. The Roman Catholic Church has redesignated the period as Passion Week, but Holy Week is still the generally used and preferred term.
REFERENCE: Religion Stylebook