• synonyms


  1. the outlet or place of discharge of a river, drain, sewer, etc.
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Origin of outfall

First recorded in 1620–30; out- + fall
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for outfall

Historical Examples

  • Otherwise, the outfall must be carried to a natural depression.

    Rural Hygiene

    Henry N. Ogden

  • I think it must have been close to the outfall of the big drain, father.

    Dick o' the Fens

    George Manville Fenn

  • The stream which discharges there into the bay is like a lake for want of outfall.

  • The next, your Honor, is an outfall betwixt a butcher and a baker.

    Punch and Judy

    Willliam J. Judd

  • All of them had collected in the pouring rain and were watching the outfall in the ditches.

British Dictionary definitions for outfall


  1. the end of a river, sewer, drain, etc, from which it discharges
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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

outfall in Science


  1. The place where a sewer, drain, or stream discharges.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.