See more synonyms for outflow on Thesaurus.com
  1. the act of flowing out: We need flood control to stem the river's outflow.
  2. something that flows out: to measure the outflow in gallons per minute.
  3. any outward movement: the annual outflow of tourists.

Origin of outflow

First recorded in 1790–1800; out- + flow
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for outflow


  1. anything that flows out, such as liquid, money, ideas, etc
  2. the amount that flows out
  3. the act or process of flowing out
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

Word Origin and History for outflow

1869, from out (adv.) + flow (n.).

Online Etymology Dictionary, © 2010 Douglas Harper