1. the expression of deep sorrow for someone who has died
2. the conventional manifestation of sorrow for a person’s death, especially by wearing black clothes

1. present participle of mourn; feeling or expressing grief or sorrow

Examples

• The family is in mourning after their grandmother’s death.
• She wore black as a sign of mourning.
• The nation observed a period of mourning for the fallen soldiers.
• He is still mourning the loss of his best friend.
• The mourning period traditionally lasts one year.
• They are mourning their pet dog who died yesterday.
• The community came together during their time of mourning.