humidity

noun

Etymology: From Middle English humidite, borrowed from Old French humidité, from Medieval Latin hūmiditās, from Latin ūmidus (“damp, moist, wet”). By surface analysis, humid + -ity.

1. Dampness, especially that of the air.

   “The high humidity made the air feel sticky and hot.”

2. The amount of water vapour in the air.

   “Plants in the greenhouse thrive in constant humidity.”