1. A state of deep sorrow following someone's death; the period of grieving
The family is in mourning after the loss of their grandfather.
A família está de luto após a morte do avô.
2. Dark clothing worn as a sign of grief and respect for the deceased
She wore black clothes as a sign of mourning.
Ela usava roupas de luto em sinal de respeito.
3. A period of time designated for grieving, typically marked by social restrictions
They observed a year of mourning according to tradition.
Observaram um ano de luto segundo a tradição.