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Both date limite and délai can be used to mean deadline. Notwithstanding the fact that délai has other meanings, are the two words complete synonyms in the sense of deadline? Or are there cases where we would use one but not the other?

  • If I have until 20/01/2017 to do something, 20/01/2017 is my "date limite" and 10 days is my "délai". There may be cases where "délai" is used in a same way as "date limite", I don't know. – Destal Jan 10 '17 at 18:09
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    Note that délai and "delay" are false friends. A delay is un retard, and by the way "retard" (as slang) is also a false friend… – jlliagre Jan 10 '17 at 18:42
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These two words are not synonyms. Date limite refers to a point on the time line and délai to a period of time.

Quel est la date limite pour rendre ce travail ?
Tu dois avoir fini pour vendredi soir/ la fin de la semaine.

Quel est le délai pour faire ce travail ?
Tu as dix jours.

It seems to me that date limite is closer to "deadline" than to délai, although date limite does not always translated as "deadline". For example, date limite de vente is "sell by date".

I can't think of an instance where I'd translate délai a "deadline".

  • Quel est le délai pour rendre ce travail ? → How long have I got to hand in this work?
  • Le délai de livraison est de 3 jours. → Allow 3 days for delivery.
  • Le délai d'attente moyen est d'au moins huit jours. → The average waiting time is at least a week.

Sometimes délai is translated as "delay", but I can only think of one instance.
Puis-je avoir un délai pour finir ce travail ? → Can I have a delay to finish that work?

  • Date limite can I think be translated to "due date" or "target date" – Laurent S. Jan 10 '17 at 19:56
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It's not really the same meaning : "date limite" is a milestone, "délai" is a duration. But you can say : "Je t'accorde un délai jusqu'à cette date limite".

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"Data limite" would be deadline/milestone, whereas "delai" is more like leadtime/delay, as in "delay line" in electronics, precisely. For sure, "delai" refers to a duration, whereas "date limite" refers to a point in time.

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