humidify

[hyoo-mid-uh-fahy or, often, yoo-]
verb (used with object), humidified, humidifying.
to make humid.

Origin:
1880–85; humid + -ify

humidification, noun
unhumidified, adjective
unhumidifying, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
humidify (hjuːˈmɪdɪˌfaɪ)
 
vb , -fies, -fying, -fied
(tr) to make (air) humid or damp
 
humidifi'cation
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
To humidify or not to humidify: that is the question.
Alternatively, humidify the air using heat recovered from the return air stream.
Central humidifiers are built into heating and air-conditioning systems, and
  humidify the whole house.
Remember, moisture from cooking and bathing helps humidify your house, making
  it more comfortable in the winter.
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