A movement in people or things with a particular way in large numbers or amounts

The movement of a real or figurative fluid.

A formalization of the idea of the motion of particles in a fluid, as a group action of the real numbers on a set.

“The notion of flow is basic to the study of ordinary differential equations.”

To move as a fluid from one position to another.

“Rivers flow from springs and lakes.”

To proceed; to issue forth.

“Wealth flows from industry and economy.”

To move or match smoothly, gracefully, or continuously.

“The writing is grammatically correct, but it just doesn't flow.”