Easter acclamation is a phrase that is sung during Easter services. It is a declaration of faith in the resurrection of Jesus Christ. It can vary from denomination to denomination.
Whether you say He is risen or Easter acclamation, both are expressions of your faith in Jesus Christ’s resurrection and hope for the future.
Examples of both greetings and Easter acclamation:
May you have a joyous Easter!
He has risen indeed! Alleluia!
Christ is risen; let us rejoice and be glad!
He has abolished death and, by His resurrection, has freed us from the power of Hades.