American Heritage® Dictionary of the English Language, Fourth Edition
- n. In relativistic quantum mechanics, the completely filled, negative energy electron state that comprises a vacuum. If a negative energy electron is promoted to a positive energy state, the hole is perceived as a positron.
- After Paul Adrien Maurice Dirac. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Professional Championships; a stage of France's Dauphine-Libre; as well as winning the 2007 Tour of Missouri.”
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