1. Grieving; sorrowing; lamenting.
2. Employed to express sorrow or grief; worn or used as appropriate to the condition of one bereaved or sorrowing; as, mourning garments; a mourning ring; a mourning pin, and the like.
(Science: botany) Mourning bride, an American ground warbler (Geothlypis Philadelphia). The male has the head, neck, and chest, deep ash–gray, mixed with black on the throat and chest; other lower parts are pure yellow.