mourn UK /mɔːn/US /mɔɹn/verb 4noun 2forms 5 verb4 •To express sadness or sorrow for; to grieve over (especially a death).For two months, she mourned her father's passing.She mourned the loss of her independence. •To engage in the social customs of mourning; to commemorate a death and/or honour the deceased socially.In that society, a spouse is mourned for one year, a parent for six months. •To wear mourning. •To utter in a sorrowful manner. noun2 •(literary) Sorrow, grief. •A ring fitted upon the head of a lance to prevent wounding an adversary in tilting. formsmourned · mourning · mourneth · mourns · mournest