1A large body of people engaged in the pursuit of a particular (especially political) aim; the activities of such a body; a social trend or impulse common to a large number of people.
2A migration or displacement of a large number of people or animals.
Origin
Mid 19th century.
Definition of mass movement in US English:
mass movement
noun
1A large body of people engaged in the pursuit of a particular (especially political) aim; the activities of such a body; a social trend or impulse common to a large number of people.
2A migration or displacement of a large number of people or animals.