rainfall

[ reyn-fawl ]
/ ˈreɪnˌfɔl /

noun

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

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British Dictionary definitions for rainfall

rainfall

/ (ˈreɪnˌfɔːl) /

noun

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

Science definitions for rainfall

rainfall

[ rānfôl′ ]

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.