[AIVC, Air infiltration and ventilation glossary, 1992]:
extracted air which is re-supplied to a space. Recirculated air is normally blended with outside air and is reconditioned.

[ASHRAE Standard 62.1]:
air removed from a space and reused as supply air.(see air, recirculation)

[ISO 16814:2008, 3.35]:
air removed from a space and reused as supplied air.