The word mazel is a fabulous word that has been used vehr vais (who knows) how long! Mazel means luck, or good fortune – and mazel tov means good luck or, more commonly, congratulations.
Interestingly, mazel is not just for Jews any more. It has become a universal expression. But that must have happened in recent times, because when someone said “mazel tov” in the presence of the late Jackie Kennedy (wife of the late President Kennedy), her response was a shrug of the shoulders. If she had spoken Yiddish, she would have uttered, “Voss meint ess – what does that mean?” But the matter never got that far, so to speak.