mourning

Short definition from Wiktionary

Verb

1. 1
   present participle and gerund of mourn

Noun

1. 1
   The act of expressing or feeling sorrow or regret; lamentation.
2. 2
   Feeling or expressing sorrow over someone's death.
3. 3
   The traditional clothes worn by those who mourn (in Western societies, typically coloured black).
4. 4
   Drapes or coverings associated with mourning.

Proper noun

1. 1
   A surname.