Etymology
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ventilate (v.)

early 15c., "to scatter, disperse (as the wind does)," from Latin ventilatus, past participle of ventilare "to brandish, toss in the air, winnow, fan, agitate, set in motion," from ventulus "a breeze," diminutive of ventus "wind" (from PIE *wē-nt-o‑ "blowing," suffixed (participial) form of root *we- "to blow").

Original notion is of cleaning grain by tossing it in the air and letting the wind blow away the chaff. Meaning "supply a room with fresh air" first recorded 1743, a verbal derivative of ventilation. Formerly with diverse slang senses, including "shoot" (someone), recorded from 1875, on the notion of "make holes in." Related: Ventilated; ventilating.

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Definitions of ventilate

ventilate (v.)
expose to the circulation of fresh air so as to retard spoilage;
Wheat should be well ventilated
ventilate (v.)
circulate through and freshen;
The gust of air ventilated the room
ventilate (v.)
furnish with an opening to allow air to circulate or gas to escape;
ventilate (v.)
give expression or utterance to;
Synonyms: vent / give vent
ventilate (v.)
expose to cool or cold air so as to cool or freshen;
Synonyms: vent / air out / air
From wordnet.princeton.edu