Source : Webster's Revised Unabridged Dictionary (1913)

Humidity \Hu*mid"i*ty\, n. [Cf. F. humidit['e].]
   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 : WordNet®

humidity
     n : wetness in the atmosphere [syn: {humidness}]