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In page Relative permittivity:
"The historical term for the relative permittivity is dielectric constant. It is still commonly used, but has been deprecated by standards organizations,[1][2] because of its ambiguity, as some older reports used it for the absolute permittivity ε.[1][3][4] The permittivity may be quoted either as a static property or as a frequency-dependent variant, in which case it is also known as the dielectric function. It has also been used to refer to only the real component ε′r of the complex-valued relative permittivity.[citation needed]
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