Pascha

 From The Catholic Company:

“Pascha” means “Passover”—it is the Aramaic form of Hebrew’s Pesach, the feast commemorating Israel’s release from bondage in Egypt. Calling Easter “Pascha” brings home the reality of Christ as the Paschal Lamb. At Passover, God commanded the Israelites to sacrifice a pure lamb and mark their doorposts with its blood. Seeing the lamb’s blood, the angel of death would skip their homes as he went throughout Egypt, slaying every firstborn male among man and beast. At Easter, Christ allowed Himself to be crucified and His Blood poured out. His Blood redeems us from eternal death, setting us apart from those who reject Him. It’s no coincidence that this event occurred during the Passover feast. (Read more.)