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An event, such as an athletic contest, that has been rained out.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physical Geography) radioactive fallout or atmospheric pollution carried to the earth by rain
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the cancellation or postponement of a sports event, performance, etc., because of rain.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Radioactive material in the atmosphere brought down by precipitation.
Dictionary of Military and Associated Terms. US Department of Defense 2005.