the GNU version of the Collaborative International Dictionary of English
n. Humidity.
The Century Dictionary and Cyclopedia
n. Humidity.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. wetness in the atmosphere
Word Usage
"Morning dawned with a hot humidness, unusual at that time of the year, but partly accounted for by the fact that they were still within the influence of the southern climate."