From Longman Dictionary of Contemporary Englishmourningmourn‧ing /ˈmɔːnɪŋ $ ˈmɔːr-/ noun [uncountable] 1 SAD/UNHAPPYgreat sadness because someone has died The Armenian authorities declared May 29 a national day of mourning.in mourning (=feeling great sadness) It was the custom to visit those in mourning and sit quietly with them.2 DCCMXblack clothes worn to show that you are very sad that someone has died She was recently widowed and wearing mourning.
Examples from the Corpus
mourning• Mourning for the death of your husband used to last up to a year.• Nevertheless, once the period of court mourning was over, Così was revived with a reasonable degree of success.• The much smaller amount of work on older women represents them as in mourning for the same psychological characteristics.• We're all supposed to be in mourning.• There has been so much mourning to do.• Friday was declared an international day of mourning for the victims.• If so, it would surely only be after a period of mourning.• The Kaddish is a prayer of mourning.• No use mourning on an empty stomach.• The widow wore mourning.in mourning• The family is in mourning.• Some of the people were in mourning. 