the act of flowing out: We need flood control to stem the river's outflow.
something that flows out: to measure the outflow in gallons per minute.
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. 2019

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British Dictionary definitions for outflow



anything that flows out, such as liquid, money, ideas, etc
the amount that flows out
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