out·​flow | \ ˈau̇t-ˌflō How to pronounce outflow (audio) , ˌau̇t-ˈflō \
outflowed; outflowing; outflows

Definition of outflow

 (Entry 1 of 2)

intransitive verb

: to flow out


out·​flow | \ ˈau̇t-ˌflō How to pronounce outflow (audio) \

Definition of outflow (Entry 2 of 2)

1 : a flowing out the outflow of dollars
2 : something that flows out outflow of a sewage treatment plant

Keep scrolling for more

Synonyms & Antonyms for outflow

Synonyms: Noun

Antonyms: Noun

Visit the Thesaurus for More 

Examples of outflow in a Sentence

Noun We joined the outflow of fans from the stadium after the game. The vents provide improved outflow of air.
Recent Examples on the Web: Verb Both of the new creations — Standard Life Aberdeen Plc and Janus Henderson Group Plc — have suffered big customer outflows in the quarters following their transformations. Washington Post, "Asset Management Is in Trouble If This Is Its Proposed Salvation," 29 Nov. 2019 The audit found that a massive exfiltration of data from Mr. Bezos’ device began hours after receiving the encrypted video file from Prince Mohammed, with the amount of outflowing data surging by nearly 30,000% and continuing for months. Justin Scheck, WSJ, "U.N. Suggests Bezos’ Phone Was Hacked Using Saudi Crown Prince’s Account," 23 Jan. 2020 Storms in eastern and southern Arizona began to die out and outflow winds from those decaying storms collided and pushed up massive walls of dust in the desert south of Phoenix. Weldon B. Johnson, azcentral, "Arizona's biggest weather stories of the past 10 years: Heat, floods and dust storms," 30 Dec. 2019 In a dry month, outflows through the canal can reduce the lake’s level by 80cm. The Economist, "Climate change threatens the Panama Canal," 19 Sep. 2019 Regulators appear more confident that years of regulatory measures will keep hot money outflows manageable. John Authers | Bloomberg, Washington Post, "China Has a Big Currency Decision to Make," 21 May 2019 However, the hydrogen and helium gas on WASP-121b is outflowing, akin to a river, dragging the metals with them, Sing continued. Fox News, "NASA discovers 'extreme' alien planet that's shaped like a football," 2 Aug. 2019 But there are concerns that in a stressed market, outflows from ETFs might make a bad situation worse. The Economist, "Why everybody is concerned about corporate-bond liquidity," 11 July 2019 Heavy rains routinely overload Baltimore’s aged sewer system, sending human waste out of manholes and outflows that pour directly into the Jones Falls. Scott Dance, baltimoresun.com, "Weekend rain washes 10 million gallons of sewage-contaminated water into Baltimore's Jones Falls," 30 May 2018 Recent Examples on the Web: Noun Government figures show a net outflow of around 120,000 people since the explosion. Washington Post, "Six portraits from a year defined by loss," 30 Dec. 2020 Before Sunday, Portland hadn’t had a widespread sewage outflow since April 2018. Mike Rogoway, oregonlive, "Stay out of the water: Weekend downpour triggers Portland sewage overflow into the Willamette," 20 Dec. 2020 Texas, Del Conte and Herman could very well be at this same spot in a year or less, given the talent outflow at Texas. Chuck Carlton, Dallas News, "Texas AD Chris Del Conte is a great salesman, but his pitch for keeping Tom Herman was confusing," 13 Dec. 2020 That new material hit the initial disk, which essentially sliced it in two, redirecting all that ejected matter in a bipolar outflow. Jennifer Ouellette, Ars Technica, "When stars collide: Solving the 16-year mystery of the Blue Ring Nebula," 18 Nov. 2020 The bureau said the ongoing outflow Sunday contains 80% stormwater and 20% sewage. Mike Rogoway, oregonlive, "Stay out of the water: Weekend downpour triggers Portland sewage overflow into the Willamette," 20 Dec. 2020 The pressure on ERs has been as much about outflow as inflow, due to the struggle to find open intensive care beds for patients with severe COVID-19 or other illnesses or injuries requiring critical hospital care. Jeremy Olson, Star Tribune, "At Minnesota hospitals, ER 'boarding' a COVID-19 consequence," 5 Dec. 2020 Trout are prevented from escaping by a mesh screen over the outflow. Rex Nelson, Arkansas Online, "Spring River country," 29 Nov. 2020 Thrust vector controls allow the pilot to direct the outflow of thrust from the engines independent of the direction the aircraft itself is pointed. Alex Hollings, Popular Mechanics, "Su-57 Vs. J-20: What the Competition Tells Us About America's New Fighter," 6 Dec. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'outflow.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of outflow


before the 12th century, in the meaning defined above


1785, in the meaning defined at sense 1

Keep scrolling for more

Learn More about outflow

Time Traveler for outflow

Time Traveler

The first known use of outflow was before the 12th century

See more words from the same century

Statistics for outflow

Cite this Entry

“Outflow.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/outflow. Accessed 22 Jan. 2021.

Keep scrolling for more

More Definitions for outflow


How to pronounce outflow (audio)

English Language Learners Definition of outflow

: an outward flow or movement of something

Keep scrolling for more

More from Merriam-Webster on outflow

Thesaurus: All synonyms and antonyms for outflow

Britannica English: Translation of outflow for Arabic Speakers

Britannica.com: Encyclopedia article about outflow

Comments on outflow

What made you want to look up outflow? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Slippery Words Quiz—Changing with the Times

  • ducreux self portrait yawning
  • What is an earlier meaning of nice?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!