Mourning

Mourning refers to process of grieving. This almost always happens at funerals whenever a loved one passes away.

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The Simple English Wiktionary has a definition for: mourning.

Not to be confused with morning

Mourning is also seen when things someone loves gets lost, although not as often. Most commonly seen is sadness, but typically a less intense but longer lasting feeling. Similar to melancholy. Mourning is only seen when a person (or animal, important object, or goal) is lost. Death is most commonly associated. Mourning is not just found in humans, but also in animals. Many birds have a sense of mourning when their mate dies.