<p><strong>Noun</strong></p><ul><li>the act of irradiating.</li><li>the state of being irradiated.</li><li>intellectual or spiritual enlightenment.</li><li>a ray of light; beam.</li><li>Optics: the apparent enlargement of an object when seen against a dark background.</li><li>the use of x-rays or other forms of radiation for the treatment of disease, the making of x-ray photographs, the manufacture of vitamin D, etc.</li><li>exposure or the process of exposure to x-rays or other radiation.</li><li>Physics: irradiance.</li></ul>