[¦klȯz·ē·əs mə′zäd·ē ′lȯ·rens′lȯ·rens i′kwā·zhən] (electromagnetism) The equation that results from replacing the real relative dielectric constant in the Clausius-Mosotti equation, or the real index of refraction in the Lorentz-Lorenz equation, with its complex counterpart.