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rainfall

[reyn-fawl]
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noun
  1. a fall or shower of rain.
  2. the amount of water falling in rain, snow, etc., within a given time and area, usually expressed as a hypothetical depth of coverage: a rainfall of 70 inches a year.

Origin of rainfall

First recorded in 1840–50; rain + fall
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for rainfall

rainfall

noun
  1. precipitation in the form of raindrops
  2. meteorol the amount of precipitation in a specified place and time
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for rainfall

n.

also rain-fall, "amount of precipitation that falls as rain," 1839, from rain (n.) + fall (n.).

Online Etymology Dictionary, © 2010 Douglas Harper

rainfall in Science

rainfall

[rānfôl′]
  1. The quantity of water, usually expressed in millimeters or inches, that is precipitated in liquid form in a specified area and time interval. Rainfall is often considered to include solid precipitation such as snow, hail, and sleet as well.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.