humidity vs. dew point

humidity

[ hyoo-mid-i-tee or, often, yoo- ]show ipa

noun

1. humid condition; moistness; dampness.
2. relative humidity.
3. an uncomfortably high amount of relative humidity: It's not the heat, it's the humidity that tires me out.

dew point

noun

1. the temperature to which air must be cooled, at a given pressure and water-vapor content, for it to reach saturation; the temperature at which dew begins to form.