Hospitalization, Hospital Admission
noun, verbal noun
So you're entering an institution. But we're not talking about any institution, we're talking specifically about hospitals. So this word means hospitalization.
にゅういん
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
明日から母が三日間入院します。
After tomorrow, my mother will be hospitalized for three days.
入院してから毎日朝ごはんはヨーグルトとリンゴでした。
Every day since I got hospitalized, my breakfast has been some yogurt and an apple.
入院中は、テレビを見たり、友人に電話をしたりしてました。
During the hospitalization, I watched TV and called my friends.