Mass movement is a term used to describe the collective movement of people in large numbers. It can be seen in many forms, such as protests, rallies, and marches. In this crossword, three terms related to mass movement are given: Wave (4 letters), GLORIA (6 letters), and Agnus Dei (8 letters). Wave is a term used to describe the collective movement of people in large numbers, often in a protest or rally. GLORIA is a Latin hymn that is often sung during religious services, and is sometimes used as a rallying cry for mass movements. Agnus Dei is a Latin phrase meaning 'Lamb of God' and is also used as a rallying cry for mass movements.