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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  
/ īnstīn′ /
  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.


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

In 1935, while studying the behavior of particles in regions of extreme gravity, Einstein and Rosen introduced what they called a “bridge”: a mathematical link between two perfectly symmetrical copies of spacetime.

From Science Daily • May 22, 2026

Proposed by Albert Einstein in 1915, general relativity describes gravity as the bending of spacetime by mass, similar to how a heavy object distorts a stretched surface.

From Science Daily • Apr. 19, 2026

A hundred years ago Einstein himself held to the then-standard belief that the universe had no beginning.

From The Wall Street Journal • Apr. 16, 2026

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

Like Einstein had said, “Imagination is more important than knowledge.”

From "Sir Fig Newton and the Science of Persistence" by Sonja Thomas

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