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What does Pauli exclusion principle mean?

Looking for the meaning or definition of the word Pauli exclusion principle? Here's what it means.

Noun
  1. (physics) A principle in quantum mechanics that states that no two identical fermions may occupy the same quantum state simultaneously.
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Examples
The next electron must align antiparallel in accordance with the Pauli exclusion principle, and thus two 4f electrons are paired.
The Pauli Exclusion Principle simply states that no two fermions may exist in the same energy state.
Because of its spin, an electron must obey a fundamental requirement known as the Pauli exclusion principle.
The omega-minus particle, according to the Pauli exclusion principle, should not exist.
The Pauli exclusion principle does not apply, however, to particles with integral spin, known as bosons, such as photons.
The Pauli Exclusion Principle prevents two fermions from occupying the same state.

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