<p><strong>Noun:</strong></p><ul><li>the act of a person who mourns; sorrowing or lamentation.</li><li>the conventional manifestation of sorrow for a person's death, especially by the wearing of black clothes or a black armband, the hanging of flags at half-mast, etc.</li><li>the outward symbols of such sorrow, as black garments.</li><li>the period or interval during which a person grieves or formally expresses grief, as by wearing black garments.</li></ul><p><strong>Adjective:</strong></p><ul><li>of, relating to, or used in mourning.</li></ul>