Definition of best man noun from the Oxford Advanced Learner's Dictionary

 

best man

 noun
noun
BrE BrE//ˌbest ˈmæn//
 
; NAmE NAmE//ˌbest ˈmæn//
 
[singular] Marriage
 
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a male friend or relative of the bridegroom at a wedding, who helps him during the wedding ceremony compare bridesmaid Wordfinderbest man, bride, ceremony, engaged, honeymoon, marriage, propose, reception, stag night, wedding See related entries: Marriage
See the Oxford Advanced American Dictionary entry: best man