<p><strong>Noun</strong></p><ul><li>A radio wave shorter than that used in AM broadcasting, corresponding to frequencies of over 1600 kilohertz: used for long-distance reception or transmission.</li><li>Shortwave radio.</li><li>A wave of electromagnetic radiation equal in length to, or shorter than, the wavelength of visible light.</li></ul><p><strong>Adjective</strong></p><ul><li>Of, relating to, or using shortwaves.</li></ul><p><strong>Verb</strong> (used with or without object)</p><ul><li>Shortwaved, shortwaving: To transmit by shortwaves.</li></ul>