the.com/maid of honor

means The bride's chief attendant — typically her closest unmarried friend or relative — who stands beside her at the wedding and leads the other bridesmaids.

from The 'maid' here is the old, plain sense of the word: an unmarried young woman (as in 'maiden'), not a domestic servant. 'Honor' marks the rank — she's the highest-placed attendant among the bridesmaids, a role distinguished from the 'matron of honor,' who is simply a married woman doing the same job. The title dates back centuries, originally describing unmarried female attendants at royal and noble courts before it settled into its modern wedding-party meaning.