Wiktionary
alt. The temperature at which the air becomes saturated and water vapor condenses to form dew. n. The temperature at which the air becomes saturated and water vapor condenses to form dew.
WordNet
n. the temperature at which the water vapor in the air becomes saturated and condensation begins
Wikipedia
In simple terms, the dew point (dew point temperature or dewpoint) is the temperature at which a given concentration of water vapor in air will form dew. More specifically it is a measure of atmospheric moisture. It is the temperature to which air must be cooled at constant pressure and water content to reach saturation. A higher dew point indicates more moisture in the air; a dew point greater than is considered uncomfortable and greater than is considered to be extremely humid. Frost point is the dew point when temperatures are below freezing.
Usage examples of "dew point".
Lucy switched over to the Manassas Automated Weather Observation Service, or AWOS, and I listened to a long mechanical rendition of wind, visibility, sky condition, temperature, dew point, and altimeter setting according to Sierra time, which was the most recent update of the day.
I tried to imagine a situation in which I might find myself dangerously imperiled by a rising dew point and could not.
If the weather did swiftly deteriorate, and in New England it most assuredly can, he would probably die, but at least he had a machine that would tell him when and let him know his final dew point.
Austin was covered with moisture that had nothing to do with the dew point.
It was hard to imagine that such a lifeless rock harbored a class-M atmosphere, but it had a low dew point and underground streams that kept moisture flowing despite the lack of real oceans.
Temperature 78 degrees, humidity 68 percent, dew point 68, wind from the east at eight miles per hour, conditions slightly overcast, visibility ten miles.
AVALON / LAKE MERSIN SURFACE CONDITIONS AT 2147 AVALON STANDARD TIME: 6000 SCATTERED, 21000 SCATTERED, VISIBILITY 10, TEMPERATURE 101, DEW POINT 67, WIND CALM, ALTIMETER 2992, LANDING VECTOR 18 RIGHT 17 LEFT VISUAL APPROACHES IN PROGRESS.