<p><strong>Noun</strong></p><ul><li>plural serenities</li><li>the state or quality of being serene, calm, or tranquil; sereneness.</li><li>Synonyms: peacefulness, peace, calm, composure</li><li>Antonyms: agitation</li><li>(usually initial capital letter) a title of honor, respect, or reverence, used in speaking of or to certain members of royalty (usually preceded by his, your, etc.).</li></ul>