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I know that “that is” comes from Latin “id est”, short “i.e.” and means “in other words”.

I would like to know whether there is a French equivalent for this phrase.

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C’est-à-dire –  Édouard Apr 28 at 11:53
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Note that i.e. is also used in french as is, especially (but not limited) to refering scientific work (mathematical, for instance). –  mansuetus Apr 28 at 12:23
    
@mansuetus, Good point! –  Lucian Sava Apr 28 at 12:47

2 Answers 2

up vote 23 down vote accepted

I think the closest translation of “that is” would be “c’est-à-dire”, which litterally means “that is to say”. It can be shortened to “c-à-d” or “c.a.d.

Autrement dit” and “en d’autres termes” also both exactly mean “in other words”.

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It’s exactly what I’m looking for, the more variants the better. Much obliged! –  Lucian Sava Apr 28 at 12:11
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@LucianSava Note the the shortened version is not nearly as common as “i.e.” is in English, I think you should generally avoid it in formal writing. –  Relaxed Apr 28 at 18:05
    
@Annoyed, duly noted! –  Lucian Sava Apr 29 at 14:03

à savoir is the French equivalent of Latin's 'id est'

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In some contexts à savoir might be a good equivalent. But would you care to elaborate a little more? –  Stéphane Gimenez Apr 30 at 17:54
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"the" French equivalent? No. –  Did May 2 at 6:33
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I think one can une à savoir and c'est-à-dire quite interchangeably, although the latter is more common. –  okiharaherbst May 3 at 10:06

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