(volcanology) A dense flow of volcanic ash, dust, rocks and debris that cascades at high speed down the slope of a volcano during an eruption.

(computing, Internet) A directory of web application files that work together to implement a user interface feature.

A diagram representing a flow or set of dynamic relationships in a system. / A flow chart.

A schematic representation of how the different stages in a process are interconnected.

Alternative spelling of airflow

(thermodynamics) An idealised fluid flow in which entropy remains constant throughout the flow, or along a particular streamline.

(physics) A smooth, streamline type of viscous flow in which the fluid behaves as a system of orderly layers, with no eddies or irregular fluctuations.

(physics) A form of irregular viscous flow in which the velocity and pressure of the fluid fluctuates at random in both time and space,

(physics) Any fluid flow in which movement is proportional to the applied force (above the yield value). / (geology) Any deformation caused by a sustained force.

(accounting) The sum of cash revenues and expenditures over a period of time. / (accounting) A statement of such transactions.