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I recently learned different usages of both kanji and I saw it is possible to
use the combination of both. It seems to me that 間中{あいだじゅう} isn't a new word.
(The other readings don't matter now.)

Here are a couple of examples which contain 間中{あいだじゅう}:

> 山田さん は テレビ を 見{み}ている間中{あいだじゅう} 食{た}べていました。  
>  Mr. Yamada was eating while watched the TV.

> デートの間中{あいだじゅう} 天気{てんき} が 悪{わる}かった。  
>  The weather was bad during the date.

I know these examples have the same meaning if I leave out 中{じゅう} because in
this case 間{あいだ} still expresses that the statement happened from the start to
end of the particular period. So I think here 中{じゅう} has been used to
emphasize the fact that the statement happened for the whole particular
period. Am I right?
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2022-01-19T17:36:28.067
93012
2022-01-21T02:12:31.063
2022-01-19T19:04:41.437
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question
grammar word-choice nuances time
What are the differences between 間中{あいだじゅう} and 間{あいだ}?
You are right, 間中 is more emphatic, and indicates something happens from the
start to the end of the period. Most of the time, you can translate ～の間 simply
as "during ～", and ～の間中 as "throughout ～", "all through ～" or "during the
entire ～". ずっと has the same function.

  * 夜の間  
during the night

  * 夜の間中 / 夜の間ずっと / 夜の間中ずっと  
all through the night / throughout the night / during the entire night

  * 寝ている間  
while sleeping

  * 寝ている間中 / 寝ている間ずっと / 寝ている間中ずっと  
the entire time one is sleeping / the whole time sleeping
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2022-01-20T04:21:43.353
93020
2022-01-20T04:36:02.110
2022-01-20T04:36:02.110
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answer