from The American Heritage® Dictionary of the English Language, 4th 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.