from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A principle in quantum mechanics holding that greater accuracy of measurement for one observable quantity entails less accuracy of measurement for another conjugate quantity.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun quantum mechanics
Heisenberg uncertainty principle.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun (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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