indefinite quantity - an estimated quantity

chemical action, chemical change, chemical process - (chemistry) any process determined by the atomic and molecular composition and structure of the substances involved

fine spray - precipitation in very small drops

hail - precipitation of ice pellets when there are strong rising air currents

rain, rainfall - water falling in drops from vapor condensed in the atmosphere

sleet - partially melted snow (or a mixture of rain and snow)

snow, snowfall - precipitation falling from clouds in the form of ice crystals

virga - light wispy precipitation that evaporates before it reaches the ground (especially when the lower air is low in humidity)

diamond dust, frost mist, frost snow, ice crystal, ice needle, poudrin, snow mist - small crystals of ice

atmospheric condition, weather, weather condition - the meteorological conditions: temperature and wind and clouds and precipitation; "they were hoping for good weather"; "every day we have weather conditions and yesterday was no exception"

drop, fall - a free and rapid descent by the force of gravity; "it was a miracle that he survived the drop from that height"

acceleration - an increase in speed; "modern science caused an acceleration of cultural change"

fastness, swiftness, speed - a rate (usually rapid) at which something happens; "the project advanced with gratifying speed"

precipitance, precipitancy, precipitateness, suddenness, abruptness - the quality of happening with headlong haste or without warning