Definition of mazel tov

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ma·zel tov also ma·zal tov    (mäzl tôf, tôv, tv) KEY 

INTERJECTION:

Used to express congratulations or best wishes.

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ETYMOLOGY:
Mishnaic Hebrew mazzl ôb, good luck : mazzl, constellation, destiny (ultimately from Akkadian manzaltu, mazzaztum, position of a star, from izuzzu, to stand; see w¹ in Semitic roots) + ôb, good; see yb in Semitic roots