rain·fall

[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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
rainfall (ˈreɪnˌfɔːl) [Click for IPA pronunciation guide]
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Rainfall is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a scrap or morsel of food left at a meal.
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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Example sentences
After that, natives and drought-adapted plants need little to no water beyond
  rainfall.
Last year poor rainfall drove up food prices which quickly moved into other
  sectors as well.
As the storm weakens, its rainfall will increase dramatically.
It is one thing to increase rainfall or reduce the size of hailstones.
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