<p><strong>Noun</strong></p><ul><li>The first day of the week, observed as the Sabbath by most Christian sects.</li></ul><p><strong>Adjective</strong></p><ul><li>Of, relating to, or characteristic of Sunday.</li><li>Used, done, taking place, or being as indicated only on or as if on Sundays: a Sunday matinée.</li></ul>