Latent means "hidden" like the latent fingerprints hidden at a crime scene.
The used to melt ice doesnt produce a temperature change, so its refered to as Latent heat.
Latent heat plays a crucial role in many atmospheric processes. For
example, the release of latent heat aids in forming the towering clouds
often seen on warm summer days
The opposite process where water vapor changes to the liquid state
In the atmosphere, condensation generates
clouds and fog.
For condensation to occur, water molecules must
release their stored heat energy, called latent heat of condensation,
equal to what was absorbed during evaporation
Relative humidity is a ratio of
the air’s actual water-vapor content compared with the
amount of water vapor air can hold at that temperature
and pressure.
Relative humidity indicates how near the air
is to saturation, rather than the actual quantity of water
vapor in the air.