<p><strong>Noun</strong></p><ul><li>An electromagnetic wave of extremely high frequency, 1 GHz or more, having wavelengths from 1 millimeter to 30 centimeters.</li><li>Microwave oven.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>To use a microwave oven.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>To cook, defrost, or otherwise prepare in a microwave oven.</li></ul>