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1. (n.) uncertainty principle
the quantum-mechanical principle, formulated by Heisenberg, that measuring either of two related quantities, as position and momentum or energy and time, produces uncertainty in measurement of the other.
Etymology: (1930–35)
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| Definition of 'uncertainty principle' |
Princeton's WordNet |
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1. (noun) uncertainty principle, indeterminacy principle
(quantum theory) the theory that it is impossible to measure both energy and time (or position and momentum) completely accurately at the same time
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Definitions of uncertainty principle 
