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What is the function of in とある?

It doesn't seem to be the particle --it doesn't seem to attach to whatever comes before it, which particles generally do. It also doesn't seem to fit any of the uses of the particle described my in books. So, I guess it must be something other than a particle.

So far, I've found this answer on 知恵袋. It suggests that is this 副詞 meaning 「そのように」 , the same in とにかく. And, as @Chocolate points out in a comment, 学研全訳古語辞典 agrees that the in とある is a 副詞.

However, in another comment, Chocolate points out that 広辞苑 says is a particle. I'm not sure how to reconcile this with the other information I've found so far. (I don't have 広辞苑 myself, so I can't verify the quote.) As I said before, it doesn't seem to behave like a particle to me, because it doesn't attach to what comes before it. Is 広辞苑 wrong?

What is this exactly?

share|improve this question
Example sentence? – istrasci Dec 27 '12 at 18:49
明鏡国語辞典では: 【連体】たまたま行きあわせた場所・日時・催し・人物などを固有名詞や日時などをはっきりそれと示さないでいう語。ある。さる。「とある秋の夕べ、とある宝飾店に入った」‌​「とある雑誌にあった、とある評論家の話」。 – user1016 Dec 28 '12 at 15:07
広辞苑は:【連体】(トは助詞。アルは有りの連体形) 或る。さる。ちょっとした。「とある家に」「とある所で」。 – user1016 Dec 28 '12 at 15:08
でも、Weblio古語辞典では: 副詞「と」にラ変動詞「あり」の連体形「ある」が付いて一語化したもの。 – user1016 Dec 28 '12 at 15:10
So I'm confused. Weblio古語辞典 says the と is 副詞. 広辞苑 says it's 助詞 (and doesn't say what kind of 助詞 it is.) – user1016 Dec 28 '12 at 16:25

In "とある宝飾店" (a jewelry store), とある is one word, and not と + ある. As a single word it means "a" or "some". It signifies that the speaker doesn't want to specify which jewelry stor eit is.

Note that there is also a sentence where とある is two words と (particle) + ある (verb: exist), such as "メニューには売り切れとある" (menu says [it is] sold out.)

share|improve this answer
Maybe とある is best remembered as a word, but even if とある is a word, it is possible that it came from と + ある and the kanji suggests it did. – Earthliŋ Jan 9 '13 at 9:01
I agree that the word とある in the question is analyzed as one word, but I think that the asker already knew this, given the link to the dictionary entry in the question. I am afraid that the question is about the origin of と in the word とある, not about how the word とある is analyzed in the modern Japanese grammar. – Tsuyoshi Ito Jan 13 '13 at 21:02

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