(meteorology) In a system of moist air, the ratio of the mass of water vapor present to the volume occupied by the mixture, that is, the density of the water vapor component. Absolute humidity is usually expressed in grams of water vapor per cubic meter or, in engineering practice, in grains per cubic foot. Because this measure of atmospheric humidity is not conservative with respect to adiabatic expansion or compression, it is not commonly used by meteorologists. (Also called vapor concentration and vapor density). See relative humidity.

(physics) The coldest possible temperature, zero on the Kelvin scale, or approximately −273.15 °C, −459.67 °F; total absence of heat; temperature at which motion of all molecules would cease.

In Italian, Spanish, Portuguese, and Catalan: the form of an adjective formed by adding the suffixes -issimo, -ísimo, -íssimo, -érrimo, -imo, or -íssim to the adjective (with any final vowel dropped) to express a superlative that cannot be exceeded, having the sense “as ... as possible”.

(mathematics) The difference (sometimes defined to be the absolute difference) between the measured or inferred value of a quantity and its true value.

Thermodynamic temperature; temperature measured on an absolute scale such as the Kelvin scale.

A true numerical majority, more than 50% of the items being counted.

(statistics) The absolute value of the difference between a given value (such as mean or expected value) and a variate value (usually an observed value).

(music, countable or uncountable) The exact pitch of a note as established by its rate of vibration based on a standard scale.

A state over which a sole monarch has absolute and unlimited power. / (uncountable) The rule of such a monarch, as a form of government.

(aviation) A type of altimeter which measures vertical distance to the surface below, using radio, radar, sonic, laser, or capacitive technology.