Air that is shut in goes stale. Make an opening, and fresh air comes in while the old air goes out. That one movement — shut in, then let through — sits under everything this word does: a room with the windows open, a pair of lungs with a machine attached, a box with holes cut in its sides, and even a feeling somebody has been holding on to.
From the word’s history
Wiktionary gives the route only as far as Latin: English borrowed ventilātus, the past participle of the verb ventilō, by way of Middle English. The packet does not gloss the Latin verb itself, so nothing further is claimed here.
資料只交代到拉丁文這一層：英文借的是動詞 ventilō 的過去分詞 ventilātus，中間經過中古英文。手上的資料沒有進一步說明那個拉丁動詞本身的字面意思，所以這裡也不再往下推。
Wiktionary entry for ventilate, etymology_text, supplied in this batch packet as kaikki:3f6f69a190036ae4:861520044
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