quantum theory

noun

Definition of quantum theory 

1 : a theory in physics based on the concept of the subdivision of radiant energy into finite quanta and applied to numerous processes involving transference or transformation of energy in an atomic or molecular scale

Examples of quantum theory in a Sentence

Recent Examples on the Web

Even today there are almost as many contending ideas for a quantum theory of gravity as scientists working on the topic. George Musser, Scientific American, "What Is Spacetime?," 8 May 2018 Turok, too, remains optimistic that a new era of physics may be just around the corner — one that might produce bold new ideas on the scale of quantum theory and relativity. Dan Falk /, NBC News, "Why some scientists say physics has gone off the rails," 2 June 2018 The relations are dictated by quantum theory or other principles, and the spatial arrangement follows. George Musser, Scientific American, "What Is Spacetime?," 8 May 2018 Both quantum theory, which governs the subatomic realm, and Einstein’s general relativity, which describes reality at cosmic scales, are often viewed as the most important developments in 20th-century physics. Alexander Hellemans, Scientific American, "A Conversation with Thomas Hertog, One of Stephen Hawking’s Final Collaborators," 24 May 2018 Hawking made the first great stride toward finding this theory by applying the quantum theory to black holes. Michio Kaku, Fortune, "Michio Kaku: The Quest That Hawking Pioneered," 19 Mar. 2018 Current is the flow of electrons; and, in quantum theory, electrons possess spins. Martin Weil, BostonGlobe.com, "Peter Gruenberg; won Nobel for work that led to quicker computers," 12 Apr. 2018 The third argument for the multiverse comes from quantum theory. Dan Falk /, NBC News, "What is the multiverse?," 22 May 2018 Becker writes in his incisive exploration of quantum theory. New York Times, "7 New Books We Recommend This Week," 17 May 2018

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

1912, in the meaning defined at sense 1

Keep scrolling for more

Learn More about quantum theory

Share quantum theory

Statistics for quantum theory

Last Updated

22 Oct 2018

Look-up Popularity

Time Traveler for quantum theory

The first known use of quantum theory was in 1912

See more words from the same year

Keep scrolling for more

More Definitions for quantum theory

quantum theory

noun

English Language Learners Definition of quantum theory

physics : a theory in physics that is based on the idea that energy (such as light) is made of small separate units of energy

quantum theory

noun

Medical Definition of quantum theory 

: a theory in physics based on the concept of the subdivision of radiant energy into finite quanta and applied to numerous processes involving transference or transformation of energy in an atomic or molecular scale

Keep scrolling for more

More from Merriam-Webster on quantum theory

Spanish Central: Translation of quantum theory

Nglish: Translation of quantum theory for Spanish Speakers

Britannica.com: Encyclopedia article about quantum theory

Comments on quantum theory

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

WORD OF THE DAY

the figure or shape of a crescent moon

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

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

TAKE THE QUIZ

Love words? Need even more definitions?

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