ventilation

noun

1.
the act of supplying fresh air and getting rid of foul air
freshen airing
Derived from:
ventilate
2.
a mechanical system in a building that provides fresh air
ventilating system ventilation system
Derived from:
ventilate
3.
free and open discussion of (or debate on) some question of public interest
public discussion
Derived from:
ventilate
4.
the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation
breathing external respiration respiration