the act of precipitating; state of being precipitated.
a casting down or falling headlong.
a hastening or hurrying in movement, procedure, or action.
sudden haste.
unwise or rash rapidity.
falling products of condensation in the atmosphere, as rain, snow, or hail.
the amount of rain, snow, hail, etc., that has fallen at a given place within a given period, usually expressed in inches or centimeters of water.
Chemistry, Physics. the precipitating of a substance from a solution.

1425–75; late Middle English < Latin praecipitātiōn- (stem of praecipitātiō) a falling headlong. See precipitate, -ion

nonprecipitation, noun
self-precipitation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
precipitation (prɪˌsɪpɪˈteɪʃən)
1.  meteorol
 a.  rain, snow, sleet, dew, etc, formed by condensation of water vapour in the atmosphere
 b.  the deposition of these on the earth's surface
 c.  the amount precipitated
2.  the production or formation of a chemical precipitate
3.  the act of precipitating or the state of being precipitated
4.  rash or undue haste
5.  spiritualism the appearance of a spirit in bodily form; materialization

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1500, "sudden haste," from M.Fr. precipitation (15c.), from L. praecipitationem (nom. praecipitatio) "act or fact of falling headlong, haste," from praecipitare "fall, be hasty," from praeceps "steep" (see precipice). Meaning "act of falling from a height" is attested
from 1610s. Meteorological sense of "rain, snow, dew, etc." is from 1670s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

precipitation pre·cip·i·ta·tion (prĭ-sĭp'ĭ-tā'shən)
The process of separating a substance from a solution as a solid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
precipitation   (prĭ-sĭp'ĭ-tā'shən)  Pronunciation Key 
  1. A form of water, such as rain, snow, or sleet, that condenses from the atmosphere, becomes too heavy to remain suspended, and falls to the Earth's surface. Different atmospheric conditions are responsible for the different forms of precipitation.

  2. The process by which a substance is separated out of a solution as a solid. Precipitation occurs either by the action of gravity or through a chemical reaction that forms an insoluble compound out of two or more soluble compounds.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

precipitation definition

In meteorology, the fall of water, ice, or snow deposited on the surface of the Earth from the atmosphere. In chemistry, a chemical reaction in a solution in which a solid material is formed and subsequently falls, as a precipitate, to the bottom of the container.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Precipitation includes rain and melted snow or sleet in inches.
As falling precipitation evaporates it moistens the dry air from the top down.
Precipitation, which includes rain and melted snow or sleet, and snowfall is in
When the vapor condenses into rain or freezes to make snow, the precipitation
  is acid, which can fall into lakes.
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