fer·​mi·​on | \ ˈfer-mē-ˌän How to pronounce fermion (audio) , ˈfər-\

Definition of fermion

: a particle (such as an electron, proton, or neutron) whose spin quantum number is an odd multiple of ¹/₂ — compare boson

Keep scrolling for more

Other Words from fermion

fermionic \ ˌfer-​mē-​ˈä-​nik How to pronounce fermionic (audio) , ˌfər-​ \ adjective

Examples of fermion in a Sentence

Recent Examples on the Web

Any two fermions that are within touching distance of each other must be different. Chris Lee, Ars Technica, "Bose Einstein condensate may reveal supersolid’s secrets," 28 Nov. 2018 The quasiparticles produced here, called Majorana fermions, are their own antimatter. Shannon Palus, Discover Magazine, "Electrons ‘Split’ in New Form of Matter," 22 Dec. 2016

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

First Known Use of fermion

1947, in the meaning defined above

History and Etymology for fermion

Enrico Fermi + English -on entry 2

Keep scrolling for more

Learn More about fermion

Statistics for fermion

Last Updated

19 Mar 2019

Look-up Popularity

Time Traveler for fermion

The first known use of fermion was in 1947

See more words from the same year

More from Merriam-Webster on fermion

Rhyming Dictionary: Words that rhyme with fermion

Britannica.com: Encyclopedia article about fermion

Comments on fermion

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


to affect and impair by alcohol or a drug

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

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!