rain fall

rainfall

[reyn-fawl]
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:
1840–50; rain + fall

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
rainfall (ˈreɪnˌfɔːl)
 
n
1.  precipitation in the form of raindrops
2.  meteorol the amount of precipitation in a specified place and time

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
rainfall   (rān'fôl')  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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