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mon meilleur ami = my best friend
un ami d'enfance = a childhood friend
bon, meilleur, le meilleur means 'good, better, the best' in French
Meilleur translates to "better,"
or "best" if used with the article --> "Le meilleur,"="the best" in English.
Vincent Meilleur was born in 1974.
Madeleine Meilleur was born on 1948-11-22.