<p><strong>Adjective</strong></p><ul><li>designating an electronic apparatus using audio frequencies: audio amplifier.</li><li>of, relating to, or employed in the transmission, reception, or reproduction of sound.</li><li>of or relating to frequencies or signals in the audible range.</li></ul><p><strong>Noun</strong></p><ul><li>the audio elements of television (video).</li><li>the circuits in a receiver for reproducing sound.</li><li>the audio part of a television broadcast.</li><li>the field of sound recording, transmission, reception, and reproduction.</li></ul>