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In relativistic quantum mechanics, the completely filled, negative-energy electron state that makes up a vacuum. If a negative-energy electron transitions to a positive-energy state, the resulting hole has the properties of a positron.
[After Paul Adrien Maurice Dirac.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.