ventilation
noun
ven·ti·la·tion
ˌven-tə-ˈlā-shən 
1
: the act or process of ventilating
2
a
: circulation of air
a room with good ventilation
b(1)
: the circulation and exchange of gases in the lungs or gills that is basic to respiration
(2)
: artificial respiration of the lungs
3
: a system or means of providing fresh air
Examples of ventilation in a Sentence
Recent Examples on the Web
Westbank will install completely new plumbing, electrical, mechanical, heating, air conditioning, and ventilation systems, according to the sources.
—
George Avalos, Mercury News, 13 Jan. 2026
But the Fed says the upgrades to its decades-old buildings were necessary, including removing asbestos and upgrading electrical and ventilation systems.
—Bryan Mena, CNN Money, 12 Jan. 2026
The project involves removing asbestos and lead contamination, updating the facilities to be compliant with accessibility laws, and upgrading electrical and ventilation systems.
—Miranda Jeyaretnam, Time, 12 Jan. 2026
Instead, briefly opening your windows (even for a few minutes each day) can make a big difference in your home's ventilation.
—Caroline Lubinsky, Martha Stewart, 12 Jan. 2026
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Cite this Entry
“Ventilation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ventilation. Accessed 19 Jan. 2026.
Kids Definition
ventilation
noun
ven·ti·la·tion
ˌvent-ᵊl-ˈā-shən
1
: the act or process of ventilating
2
: circulation of air
a room with good ventilation
3
: a system or means of providing fresh air
Medical Definition
ventilation
noun
ven·ti·la·tion
ˌvent-ᵊl-ˈā-shən
1
: the circulation and exchange of gases in the lungs or gills that is basic to respiration
2
: artificial respiration of the lungs
3
: the circulation of air through a space and especially an enclosed space
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