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.

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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

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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.

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Other Word Forms

• Einsteinian
  adjective

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Example Sentences

See Examples For:

Einstein

Einstein famously referred to his introduction of the cosmological constant as his "biggest blunder," since his original equations without the additional term could have predicted an expanding universe.

From Science Daily ● Oct. 29, 2026

This relational view of space is also how Albert Einstein understood it, but he assumed there was no limit to how small things could be, or how close together.

From The Wall Street Journal ● Oct. 23, 2026

He’ll know AGI is here when it passes what he calls the Einstein test: Could a system trained only on human knowledge up to 1901 produce Einstein’s work from the annus mirabilis of 1905?

From The Wall Street Journal ● Oct. 21, 2026

"By revealing this previously hidden soft X-ray phase, Einstein Probe opens a new window for studying neutron star merger remnants and may ultimately help constrain the neutron star equation-of-state."

From Science Daily ● Oct. 8, 2026

Einstein had proposed stranger things and had been entirely right.

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

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