HUMIDITY
humidity, humidness
(noun) wetness in the atmosphere
Source: WordNet® 3.1
Etymology
Noun
humidity (usually uncountable, plural humidities)
Dampness, especially that of the air.
The amount of water vapour in the air.
Source: Wiktionary
Hu*mid"i*ty, n. Etym: [Cf. F. humidité.]
Definition: Moisture; dampness; a moderate degree of wetness, which is
perceptible to the eye or touch; -- used especially of the
atmosphere, or of anything which has absorbed moisture from the
atmosphere, as clothing.
Note: In hygrometrical reports (as of the United States Signal
Service) complete saturation of the air is designated by Humidity
100, and its partial saturation by smaller numbers.
Source: Webster’s Unabridged Dictionary 1913 Edition