(also see: Unidirectional Airflow)

Smooth, predictable air flow in which the velocity at any specific point doesn't change in time in either magnitude or direction

Generally defined as airflow in which the entire body of air within a confined area moves in essentially unidirectional velocity along parallel flow lines. Laminar airflow is technically defined as fluid flow in which its velocities are free of macroscopic fluctuations which generally occur when the Reynolds number is less that 2000 (Reynolds number is the ratio of inertial to vicous forces in a pipe or duct).