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What is the plural of "scenario"? I have always used "scenarios", but have recently come across "scenaria" and "scenarii". Should I be treating it as an Italian or Latin word?

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It's not Latin. And the only way you could get to scenaria would be by projecting the Italian word back to a (non-existent, as far as I know) Latin word scenarium, of which scenaria would indeed be the plural. –  Colin Fine Mar 26 at 11:14
    
Maybe hypercorrection, as some answers guess. Or maybe as a joke. –  GEdgar Mar 26 at 13:16
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4 Answers

up vote 16 down vote accepted

Here are the stats from the Corpus of Contemporary American English and the British National Corpus:

           COCA    BNC

scenarios  3683    216
scenaria      0      0
scenarii      0      0

Merriam-Webster, Wiktionary, the American Heritage Dictionary of the English Language, and the Collins English Dictionary only mention scenarios.

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Heh.. I saw mplungjan's answer but not yours while I was typing. Our answers are quite similar. I would upvote, but I've reached my daily vote limit:-) –  Tragicomic Feb 8 '11 at 13:05
    
:( So that is why I got no votes ... –  mplungjan Feb 8 '11 at 13:25
    
@mplungjan: You probably would but for this vote limit.. –  Tragicomic Feb 8 '11 at 13:32
    
+1 Good answer:-) –  Tragicomic Feb 9 '11 at 6:38
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Wiktionary reports that the plural of scenario is scenarios. It also reports that the "hypercorrect" plural of scenario is held to be scenarii (which is nonstandard and rare) since its etymology is Italian.

From scenario, the terminal o having been replaced with an i to form its plural, as per the Italian -o → -i pattern for forming plurals, by analogy with concerti and virtuosi. However, the plural of the Italian word scenario is scenari, making “scenarii” etymologically inconsistent.

According to Merriam-Webster and the OED, the accepted plural of scenario is scenarios. The Corpus of Contemporary American English reports 3683 instances of scenarios being used and none of scenarii.

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+1 for reading Wiktionary more carefully than I have. (^_^) –  RegDwigнt Feb 8 '11 at 13:12
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Interesting, but if the quotation in @mplungjan’s entry is accurate, then scenarii wouldn’t actually be etymologically inconsistent: scenari is the modern spelling of the Italian plural, but scenarii was the older form of it, appropriate from when the word was originally borrowed. –  PLL Feb 8 '11 at 15:57
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I am sure they were hypercorrecting: http://www.google.com/search?q=scenario+plur

However they might have been old Italians:

http://fr.wikipedia.org/wiki/Sc%C3%A9nario

Le mot provient de l’italien scenario, « décor de théâtre ». En français, le mot s’est d’abord utilisé sans accent comme en italien, mais cet usage est archaïque.

Ni le pluriel italien archaïque scenarii (ancienne orthographe[1]), ni sa variante francisée scénarii (avec accent aigu) ne sont d'usage courant : le pluriel scénarios est le plus commun en français[2]. Selon l’Académie française, en effet, le mot scénario étant français (en italien, il n'aurait pas d'accent aigu), le pluriel « scénarios » s'impose - exactement comme pour lavabos ou pianos.[3]

The word comes from Italian scenario, “theatre scenery”. In French, the word was originally used without an accent as in Italian, but this is archaic.

Neither the archaic Italian plural scenarii (old spelling[1]), nor its French variant scénarii (with acute accent) is currently used: the plural scénarios is most common in French. Indeed, according to the Académie Française, since scénario is a French word (in Italian, there would be no acute accent), the plural scénarios is required — just as in lavabos, pianos.[3]

A Scenario in Italian is Sceneggiatura according to Wikipedia. Not what we are looking for here according to Francesco

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Nice answer — but when including material in another language, it’s helpful to give a translation to English, since otherwise it won’t be useful for many users. I’ve taken the liberty of adding one myself, but I’m not a fluent French speaker so it may well be imperfect. –  PLL Feb 8 '11 at 15:46
    
Looks OK to me :) –  mplungjan Feb 8 '11 at 16:10
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"Sceneggiatura" actually means "script", like in a "script of a movie". A scenario in italian is "Scenografia" when it means "thatre scenery" and is a "scenario" like in "generating scenarios according to some probability distribution". –  Francesco Feb 8 '11 at 19:01
    
Yeah my Italian colleague was not too clear when I asked –  mplungjan Feb 8 '11 at 19:04
    
@PLL: Thanks for adding the translation. –  Tragicomic Feb 9 '11 at 6:38
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“scenarios” is the correct one.

And by the way, in Italian the plural is “scenari” (single i).

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@mplungjan, Italian words ending in -a typically pluralise to -e, not to -as. –  Peter Taylor Feb 8 '11 at 13:35
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