definition of
Einstein

[1] #1 Einstein n. [Albert Einstein] physicist born in Germany who formulated the special theory of relativity and the general theory of relativity; Einstein also proposed that light consists of discrete quantized bundles of energy (later called photons) (1879-1955). wn

[2] #2 Einstein n. [genius, mastermind, brain, brainiac] someone who has exceptional intellectual ability and originality; "Mozart was a child genius"; "he's smart but he's no Einstein". wn