taken from merriam-webster.com's mourning definition on 8-04-2021
1-the act of sorrowing. She is still mourning
2a-an outward sign (such as black clothes or an armband) of grief for a person's death. lots of people there and only one in full mourning.-Arnold Bennett
2b-a period of time during which signs of grief are shown after a long mourning, resume their ordinary dresses Henry Reed