a fall or shower of rain.
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. 2019

Related Words for rainfall

shower, moisture, rain

Examples from the Web for rainfall

Contemporary Examples of rainfall

Historical Examples of rainfall

British Dictionary definitions for rainfall



precipitation in the form of raindrops
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

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



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.