<p><strong>Noun</strong></p><ul><li>The state or quality of being light in weight: the amazing lightness of the new metal.</li><li>The quality of being agile, nimble, or graceful.</li><li>Lack of pressure or burdensomeness.</li><li>Lack of seriousness; levity in actions, thoughts, or speech: That kind of lightness seemed out of place.</li><li>Gaiety of manner, speech, style, etc.; cheerfulness: His lightness was just what the party needed.</li></ul>