Learner's definition of MOURNING
[noncount]
1
: the act of mourning for someone who has died哀悼；服丧 -
a day of national mourning国丧日
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She is still in mourning for her dead husband.她现在仍在为她死去的丈夫服丧。
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The whole town was in mourning.全城哀悼。
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She went into mourning for her dead husband. [=she began to mourn for her dead husband]她开始为她死去的丈夫服丧。
2
: great sadness felt because someone has died沉痛哀悼之情 3
: black clothing that is worn to show that you are mourning for someone who has died（黑色的）丧服