Pronunciation

How to pronounce “ventilation

“ventilation” is pronounced /vɛntɪleɪʃən/ — 4 syllables.
The sound

Say “ventilation

ventilation

/vɛntɪleɪʃən/

Say it right

4 syllables. Stress the 'at' part (say it longer and louder) and let the others relax — unstressed vowels often soften to a lazy /ə/.
Meaning

the act of supplying fresh air and getting rid of foul air

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