Mourn/mɔːrn/ Definition 1 of 2Pro Tip 1/3Human Emotion Mourn usually describes a deep emotional response to death. She could hardly speak as she mourned her husband. Pro Tip 2/3Extended Period Mourning can last for a long time and is not limited to immediate aftermath. Many years after the war, people still mourn the fallen. Pro Tip 3/3Public Expression Mourn includes public expressions of grief, like funerals or memorials. The entire community gathered to mourn the local hero.