The definition of a matron of honor is a woman, often an older or married woman, who is chosen by the bride at a wedding to stand up for the bride and to be an assistant in the planning and carrying out of the wedding.
(noun)An example of a matron of honor is the older and married best friend of a bride who throws the bridal shower and who walks down the aisle right before the bride at the wedding.
See matron of honor in Webster's New World College Dictionary
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See matron of honor in American Heritage Dictionary 4