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Einstein

American  
[ahyn-stahyn, ahyn-shtahyn] / ˈaɪn staɪn, ˈaɪnˌʃtaɪn /

noun

  1. Albert 1879–1955, German physicist, U.S. citizen from 1940: formulator of the theory of relativity; Nobel Prize 1921.

  2. Alfred 1880–1952, German musicologist in U.S.

  3. (lowercase) a unit of radiant energy, equal to the energy of radiation that is capable of photochemically changing one mol of a photosensitive substance.

Einstein British  
/ ˈaɪnstaɪn /

noun

  1. Albert. 1879–1955, US physicist and mathematician, born in Germany. He formulated the special theory of relativity (1905) and the general theory of relativity (1916), and made major contributions to the quantum theory, for which he was awarded the Nobel prize for physics in 1921. He was noted also for his work for world peace

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Einstein Scientific  
/ īn′stīn′ /

  1. German-born American theoretical physicist whose theories of Special Relativity (1905) and General Relativity (1916) revolutionized modern thought on the nature of space and time and formed a theoretical base for the exploitation of atomic energy. He won the 1921 Nobel Prize for physics for his explanation of the photoelectric effect.

Other Word Forms

  • Einsteinian adjective

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In 1931, the Nobel Prize-winning physicist Albert Einstein was spending his first winter at Caltech, and he wrote to a friend, “Here in Pasadena, it is like Paradise. Always sunshine and clear air …”

From Los Angeles Times • Mar. 26, 2026

It's hard to call, so this was one of the games I mentioned earlier where I was thinking, 'What would Einstein say?'.

From BBC • Feb. 26, 2026

Glass' groundbreaking moment came in 1976 when he premiered "Einstein on the Beach" -- a work that tore apart basic expectations of opera and marked a coming of age for the avant-garde.

From Barron's • Jan. 27, 2026

Vuitton is rooted in travel, and Shanghai, a port city where figures from Albert Einstein to Charlie Chaplin once arrived by ship, has long been shaped by it.

From The Wall Street Journal • Dec. 20, 2025

Unfortunately for Einstein, the laws of quantum mechanics work incredibly well, and you can’t successfully explain quantum effects with traditional classical physics.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.