Meaning of Einstein

Ein•stein

1. 1879–1955, German physicist, U.S. citizen from 1940: formulator of the theory of relativity; Nobel prize 1921.
2. 1880–1952, German musicologist in U.S.
3. (l.c.)a unit of radiant energy, equal to the energy of radiation that is capable of photochemically changing one mol of a photosensitive substance.