" heisenberg uncertainty principle "

[Noun]  | "Hei*sen*berg uncertainty principle" | \ ˈhī-zᵊn-ˌbərg- \

1: uncertainty principle —called also Heisenberg's uncertainty principle

Origin: 1939 ;

 After Werner {see: |heisenberg|Heisenberg:b};

[Noun]  | "uncertainty principle" 

1: a principle in quantum mechanics: it is impossible to discern simultaneously and with high accuracy both the position and the momentum of a particle (such as an electron) —called also Heisenberg uncertainty principle

Origin: 1929 ;