- The Pauli exclusion principle is the principle that two particles of a specified type aren't able to be in the same place at the same time.
An example of the Pauli exclusion principle is that two electrons in an atom must be spinning in opposite directions if they are in the same space.
Pauli exclusion principle definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the principle that no two electrons, protons, etc. in a given system can have the same set of quantum numbers and, thus, that no two can occupy the same space at the same time
Origin: after Wolfgang Pauli
Pauli exclusion principle definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
See exclusion principle.
Origin: After Wolfgang Pauli.
pauli exclusion principle - Science Definition
The principle that two fermions of a given type, such as electrons, protons, or neutrons, cannot occupy the same quantum state. It does not apply to bosons. This principle plays a key role in the electron orbital structure of atoms, since it prevents more than two electrons from occupying any given orbital (two are allowed, since they may have opposite spin, and thus be in different quantum states). See also orbital, degeneracy pressure.