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ventilation (n.)

"process of replacing foul air in an enclosed place with fresh, pure air," 1660s, from Latin ventilationem (nominative ventilatio) "an exposing to the air," noun of action from past participle stem of ventilare (see ventilate).

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Definitions of ventilation from WordNet

ventilation (n.)
the act of supplying fresh air and getting rid of foul air;
Synonyms: airing
ventilation (n.)
a mechanical system in a building that provides fresh air;
she was continually adjusting the ventilation
Synonyms: ventilation system / ventilating system
ventilation (n.)
free and open discussion of (or debate on) some question of public interest;
Synonyms: public discussion
ventilation (n.)
the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation;
Synonyms: breathing / external respiration / respiration
From wordnet.princeton.edu