the energy required to remove an electron from an atom.
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Origin of ionization potential
First recorded in 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for ionization potential
the energy usually required to remove an electron from an atom, molecule, or radical, usually measured in electronvoltsSymbol: I Compare electron affinity
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012