humidity

[hyoo-mid-i-tee or, often, yoo-]
noun
1.
humid condition; moistness; dampness.
3.
an uncomfortably high amount of relative humidity: It's not the heat, it's the humidity that tires me out.

Origin:
1350–1400; Middle English humydite < Latin (h)ūmiditās. See humid, -ity

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
humidity (hjuːˈmɪdɪtɪ)
 
n
1.  the state of being humid; dampness
2.  relative humidity See absolute humidity a measure of the amount of moisture in the air

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

humidity hu·mid·i·ty (hyōō-mĭd'ĭ-tē)
n.
Dampness, especially of the air.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
humidity   (hy-mĭd'ĭ-tē)  Pronunciation Key 
The amount of water vapor in the atmosphere, usually expressed as either absolute humidity or relative humidity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
humidity (relative and absolute)

The amount of water vapor in the air. Humidity is measured in two ways: (1) Absolute humidity is the percentage of water vapor actually present in the air. (2) Relative humidity is the absolute humidity divided by the amount of water that could be present in the air. Relative humidity indicates the degree of comfort or discomfort one feels from the humidity, because it indicates the amount of perspiration that can evaporate from the skin.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
But any gains in that department were more than offset by the problems of cold
  weather and humidity.
Weather is the day-to-day temperature, humidity and precipitation.
My new office has a humidity problem, to the point where the carpet felt damp.
He says the problem is the weather, and particularly the humidity.
Synonyms
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