2
: a continuous moving on or passing by (as of a stream)
3
: a continued flow : flood
a flux of words
4
a
: 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
Synonyms
Examples of flux in a Sentence
Noun
the English language is always in a state of flux
January typically brings a great flux of returns to department stores.
Verb
a solid will flux more quickly under pressure
Recent Examples on the Web
Maggie Chen, WIRED, 19 Apr. 2024
Fleurs et Sel is currently open three to four days a week between Wednesday and Saturday; hours and days of operation are still in flux.
—Stephanie Breijo, Los Angeles Times, 16 Apr. 2024
See all Example Sentences for flux 
Noun
Because the microbiome is always in flux, reestablishing balance after infection is key—throwing lots of antibiotics or antifungals at the problem can result in a never-ending game of biological whack-a-mole where one imbalance leads to another.
—Maggie Chen, WIRED, 19 Apr. 2024
Fleurs et Sel is currently open three to four days a week between Wednesday and Saturday; hours and days of operation are still in flux.
—Stephanie Breijo, Los Angeles Times, 16 Apr. 2024
See all Example Sentences for flux
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'flux.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near flux
Cite this Entry
“Flux.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flux. Accessed 6 May. 2024.
Copy CitationKids Definition
flux
1 of 2 noun1
a
: a flowing in
flux of the tide
b
: a series of changes : a state of continuous change
2
: a substance used to aid the melting or joining (as by removing impurities) of metals or minerals
flux
2 of 2 verb1
: to become or cause to become fluid : fuse
2
: to treat with a flux
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