ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. Imaginary dielectric constant Soil reponse of a reflected standing electromagnetic wave of a particular frequency which is related to the dissipation (or loss) of energy within the medium. This is the imaginary portion of the complex dielectric constant. Originally from the CUAHSI HIS VariableNameCV. See: http://his.cuahsi.org/mastercvreg/edit_cv11.aspx?tbl=VariableNameCV.