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The Japanese word

中旬

is pronounced
chuujun | ちゅうじゅん
means
second third of a month
Examples:
予定日は1月中旬頃です。
yotei bi wa ichigatsu chūjun goro desu.
I'm expecting my baby in the middle of January.
彼は5月中旬に日本に戻れるでしょう。
kare wa gogatsu chūjun ni nippon ni modoreru desho u.
He will come back to Japan in the middle of May.
Examples sourced from tatoeba.org