(historical) The public pursuit of a criminal, accompanied by shouts to warn others to give chase.

The ratio of the mass of water vapour to mass of air.

(meteorology) The ratio of the actual amount of water vapor (absolute humidity) present in the air to the saturation point at the same temperature, usually expressed as a percentage.

(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.

The fundamental set of qualities, and the range of behaviour, shared by all humans.

A confused uproar, commotion, tumult or racket.

(intransitive) To cause a tumult or racket.

Dampness, especially that of the air. / The amount of water vapour in the air.

(technology) Acronym of head-up display.

(US, politics) Acronym of Department of housing and urban development.