noun The act of expressing or feeling sorrow or regret; lamentation.
noun Specifically, the act of expressing or feeling grief regarding a death or loss.
noun A social state or period that acknowledges a recent bereavement, which may involve social withdrawal, the observance of customs or rituals related to bereavement, etc.
noun The traditional clothes worn by those who mourn (in Western societies, typically coloured black).
noun A drape or covering associated with mourning.