\ ˈfləks \

Definition of flux 

(Entry 1 of 2)

1 : a flowing of fluid from the body: such as

a : diarrhea

b : dysentery

2 : a continuous moving on or passing by (as of a stream)

3 : a continued flow : flood a flux of words

4a : influx

b : change, fluctuation in a state of flux the flux following the death of the emperor

5 : a substance used to promote fusion (as of metals or minerals) especially : one (such as rosin) applied to surfaces to be joined by soldering, brazing, or welding to clean and free them from oxide and promote their union

6 : the rate of transfer of fluid, particles, or energy across a given surface


fluxed; fluxing; fluxes

Definition of flux (Entry 2 of 2)

transitive verb

1 : to cause to become fluid

2 : to treat with a flux

intransitive verb

: to become fluid : fuse

Keep scrolling for more

Synonyms & Antonyms for flux

Synonyms: Noun

affluence, income, inflow, influx, inpouring, inrush

Synonyms: Verb

deliquesce, fuse, liquefy (also liquify), melt, run, thaw

Antonyms: Noun

outflow, outpouring

Antonyms: Verb

harden, set, solidify

Visit the Thesaurus for More 

Examples of flux in a Sentence


the English language is always in a state of flux January typically brings a great flux of returns to department stores.


a solid will flux more quickly under pressure
See More

Recent Examples on the Web: Noun

The race is also in flux because turnout in any special election is difficult to forecast, and this one falls during summer vacation season. Michael Tackett, New York Times, "Door-Knocking Democrat Tries to Break G.O.P. Grip in Ohio Special Election," 13 July 2018 Colts last 10 years: 4-2, including 1-1 in the playoffs Analysis: As much as the Colts are changing, the Jets may be more in flux. Scott Horner, Indianapolis Star, "What you need to know about Colts vs. Jets," 13 July 2018 The fashion world, much like the world at large, is currently in a state of flux. refinery29.com, "Stylist Christine Centenera Wants To Change The Way You Shop," 10 July 2018 Chelsea are of course not unfamiliar with living in a state of flux. SI.com, "The Mounting Uncertainty at Chelsea Has Seen the Club Relinquish Their Top 4 Birthright," 9 July 2018 At its core lay the realization battered into him on his first journey down the Colorado about humanity’s impermanence in the face of geologic time and how the Earth remained in a continual state of flux. Johnforristerross, Longreads, "Taming the Great American Desert," 2 July 2018 Josh Fields was placed on the 10-day disabled list because of right-shoulder inflammation on Thursday, throwing the back of the Dodgers’ bullpen into a state of flux. Mike Digiovanna, latimes.com, "Loss of Josh Fields throws off Dodgers' bullpen," 29 June 2018 For better or worse, San Francisco is perpetually in a state of flux. Sarah Fritsche, SFChronicle.com, "Best new restaurants and bars to visit in the Mission right now," 17 June 2018 After a period of flux, downtowns began attracting residential properties and a new wave of retailers. John Sowell, idahostatesman, "Panera Bread will open, then Hilton Garden Inn. Entryway to Downtown Boise takes shape," 6 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'flux.' 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 flux


14th century, in the meaning defined at sense 1


15th century, in the meaning defined at transitive sense 1

History and Etymology for flux


Middle English, from Anglo-French & Medieval Latin; Anglo-French, from Medieval Latin fluxus, from Latin, flow, from fluere to flow — more at fluid


see flux entry 1

Keep scrolling for more

Learn More about flux

Statistics for flux

Last Updated

11 Aug 2018

Look-up Popularity

Time Traveler for flux

The first known use of flux was in the 14th century

See more words from the same century

Keep scrolling for more

More Definitions for flux



English Language Learners Definition of flux

: a series of changes : continuous change

: a substance used for helping to melt or join metals


\ ˈfləks \

Medical Definition of flux 

1a : a flowing or discharge of fluid from the body especially when excessive or abnormal: as

(1) : diarrhea

(2) : dysentery

b : the matter discharged in a flux

2 : the rate of transfer of fluid, particles, or energy across a given surface

Keep scrolling for more

Comments on flux

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


the setting in which something occurs

Get Word of the Day daily email!

Test Your Vocabulary

Musical Words Quiz

  • gramophone
  • Which word describes a musical performance marked by the absence of instrumental accompaniment?
True or False

Test your knowledge - and maybe learn something along the way.


Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

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