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For the word (or composition of two words): 唯一, sometimes also written as:
唯一つ,

Two possible pronunciations come to my mind:

  * ゆいいつ [ _yuiitsu_ ] -onyomi

and

  * ただ ひとつ [ _tada hitotsu_ ] -kunyomi

**Which one is correct?** Does the last つ in written form make any difference?
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2018-08-13T17:57:58.863
60839
2018-08-14T02:07:16.330
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question
pronunciation adverbs numbers
What is the correct pronunciation of 唯一
唯一 and 唯一つ both work as a _no_ -adjective and a standalone adverb, but they
are different.

  * **唯一** is one word and only read as ゆいいつ in modern Japanese. (ゆいいち is another possible reading according to [this entry](https://dictionary.goo.ne.jp/jn/223584/meaning/m0u/), but I believe you can forget it)
  * **唯一つ** (with okurigana つ) is two words, ただひとつ.

They are not always interchangeable. For example you can say 唯一の生存者 ("sole
survivor") and 唯【ただ】一人【ひとり】の生存者 but not 唯一つの生存者.
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2018-08-14T01:48:11.323
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2018-08-14T02:07:16.330
2018-08-14T02:07:16.330
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answer