[AIVC, Air infiltration and ventilation glossary, 1992]:the pattern of static pressure variation at various points inside a building due to variations in air density and air flow into and out of the building.

[EN 12792:2003, 231 ]:volume of air in unit time induced into the primary air flow inside the air terminal device

[AIVC, Air infiltration and ventilation glossary, 1992]:the process of air exchange between internal zones of a building.