Humidity (noun)

1. The amount of moisture in the air.
2. A feeling of discomfort caused by the air being too moist.

Origin:

Late 16th century: from latin humiditas, from humere 'to be moist'. the adjective humid was formed from the same latin root.

Examples:

1. The humidity level in the room was very high.
2. The humidity was making it difficult for her to breathe.
3. She could feel the humidity in her hair.
4. The humidity was causing the ink to smudge.
5. The weatherman reported high humidity for the next few days.