Mourning dream meaning is explained below using 14 different sources. Each interpretation is shown with its source.

Interpretation 1 — Pamela Ball

also see Funeral and Weeping

1- The process of mourning Is an important one in all sorts of ways. We not only mourn death but also the end of a relationship or a particular part of our lives. Since sometimes mourning or grieving is seen as inappropriate in waking life, it will often appear in dreams as a form of relief or release.

2- In many cultures less emotionally repressed than our own, the period of mourning is seen as a way of assisting the departing soul on its way. In dreams we may find that we are helping ourselves to crcate a new beginning through our mourning for the old. Psychologically, we need a period of adjustment when wc have lost something, and need to grieve for ourselves as much as for what we have lost.

3- Grief. We may need to look at how we deal with grief on both a spiritual and physical level.

Source: Ten Thousand Dream Dictionary Author: Pamela Ball

Interpretation 2 — Versatile - Anonymous

Psychological / emotional perspective: In many cultures less emotionally repressed than our own, the period of mourning is seen as a way of assisting the departing soul on its way. In dreams we may find that we are helping ourselves to create a new beginning through our mourning for the old. Psychologically, we need a period of adjustment when we have lost something (for instance when a relationship ends) and need to grieve for ourselves as much as for what we have lost.
Source: Dream Meanings of Versatile Author: Versatile - Anonymous

Interpretation 3 — myjellybean

To dream that you are in mourning, refers to your inability to let go of the past. You need to clear away your feelings about those old experiences and make way for the new.

To dream that you are wearing black clothing for mourning, symbolizes grief, bad luck, and unhappiness.

To see others wearing mourning clothes in your dream, signifies disturbing influences and misunderstandings among your friends. Also see “Death.”

Source: My Dream Interpretation Author: myjellybean

Interpretation 4 — Martha Clarke

It is a manifestation of death. This does not necessarily mean that the dream is premonitory of such an event. More than anything, it alludes to the dreamer’s desire to see the end of an undesirable situation they do not know how to bring to a close. To dream of death is not a negative dream. It almost always manifests the intention of rebirth, of renewal. (See BURIAL and DEATH) 
Source: The Big Dictionary of Dreams Author: Martha Clarke

Interpretation 5 — Zolar

lucky numbers: 14-20-31-38-40-44

being in, over parents: an early wedding of which you are the planner.

relatives: invitation to a dance that wil produce congenial company.

wife or husband, each other: emotional sorrow revisited frees a way for better times.

wearing black, clothes: foreshadows the emergence of a creative force—you.

Source: Zolar’s Book of Dreams Numbers and Lucky Days Author: Zolar

Interpretation 6 — Versatile - Anonymous

Material aspects: The process of mourning is an important one in all sorts of ways. We not only mourn death but also the end of a relationship or a particular part of our lives. Since sometimes mourning or grieving is seen as inappropriate in waking life, it will often appear in dreams as a form of relief or release.
Source: Dream Meanings of Versatile Author: Versatile - Anonymous

Interpretation 7 — Gustavus Hindman Miller

To dream that you wear mourning, omens ill luck and unhappiness.

If others wear it, there will be disturbing influences among your friends causing you unexpected dissatisfaction and loss.

To lovers, this dream foretells misunderstanding and probable separation.

Source: Ten Thousand Dream Interpretation Author: Gustavus Hindman Miller

Interpretation 8 — Versatile - Anonymous

Mourning expresses grief, a coming to terms with loss. In the spiritual sense we may believe in life after death but we still no longer have the physical presence of the individual.
Source: Dream Meanings of Versatile Author: Versatile - Anonymous

Interpretation 9 — Internet Archive - Anonymous

A dream of contrary; as also is FEASTING and jollification. Great prosperity is before you, if you are a business man, or married happiness if you are a lover.
Source: Mystic Dream Book Author: Internet Archive - Anonymous

Interpretation 10 — Raymond Buckland

To dream of being in mourning is a reversal of what will actually happen. It means that you will soon have cause for great celebration.
Source: Gypsy Dream Dictionary Author: Raymond Buckland

Interpretation 11 — Betty Bethards

Inability to release people, experiences or beliefs in order to make way for the new. Transition; open to receive new direction.
Source: The Dream Books Symbols Author: Betty Bethards

Interpretation 12 — Gillian Holloway

To dream of seeing others wearing mourning or to wear it yourself, is an indication of the separation of lovers.
Source: The Complete Dream Book Author: Gillian Holloway

Interpretation 13 — Ibn Seerin

Mourning means rejoicing and rejoicing means mourning.
Source: Islamic Dream Interpretation Author: Ibn Seerin

Interpretation 14 — Stearn Robinson - Tom Corbett

See Grief and Sorrow.
Source: The Complete Guide to Interpreting Your Dreams Author: Stearn Robinson - Tom Corbett