This is the Roman Catholic doctrine. Jesus is continuously being sacrificed every time a Mass occurs. The Lutheran doctrine is similar to the Catholic view. Jesus death occurs again when the bread and wine enter the person. This is not found in the scripture.
Communion is a spiritual event.
The word is not in the scriptures. Used by a number of churches. Roman Catholic Transubstantiation. Not found in scriptures. Decided by each local church, but it should not become merely ritualistic without meaning.