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Related to relative permittivity: Relative permeability
See dielectric constant.
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.
(General Physics) the ratio of the permittivity of a substance to that of free space. Symbol: εr Also called: dielectric constant
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