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VENTILA'TION, noun [Latin ventilatio.]

1. The act of ventilating; the act or operation of exposing to the free passage of air, or of causing the air to pass through any place, for the purpose of expelling impure air and dissipating any thing noxious.

2. The act of fanning or winnowing, for the purpose of separating chaff and dust.

3. Vent; utterance. [Not in use.]

4. Refrigeration. [Not in use.]