Home › Words › H › humidityhumidity/hjuːˈmɪd.ə.ti/humidity · noun — dampness, especially that of the air.Definition from Wiktionary (CC BY-SA 3.0).humidity is pronounced /hjuːˈmɪd.ə.ti/.EtymologyFrom Middle English humidite, borrowed from Old French humidité, from Medieval Latin hūmiditās, from Latin ūmidus (“damp, moist, wet”). By surface analysis, humid + -ity.nounDampness, especially that of the air.e.g.“The high humidity made the air feel sticky and hot.”The amount of water vapour in the air.e.g.“Plants in the greenhouse thrive in constant humidity.”Definitions & examples from Wiktionary (CC BY-SA 3.0).