condensation
n. uncountablen. the small drops of water that form on a cold surface when it touches warm, wet air. You often see this on windows in the winter or on a cold drink in the summer.
n. the process by which a gas or vapour changes into a liquid state, typically upon cooling. Also refers to the liquid droplets resulting from this physical change.
Wipe the condensation off the window so you can see outside.
Without proper ventilation in the bathroom, condensation will eventually lead to mould growth on the ceiling.
The physicist explained that condensation occurs when water vapour molecules lose kinetic energy upon hitting a cold surface, causing them to bond together into liquid droplets.
From condense + -ation, borrowed from Latin condēnsātiō, condēnsātiōnem.
Uncountable when referring to the physical process or the general presence of moisture; occasionally countable in technical contexts referring to specific instances.